Hanko to Uusikaupunki by boat

The Hanko–Uusikaupunki fairway is the main leisure craft fairway through the Archipelago Sea. There are lots of sidetrips to be done, but this fairway is well marked and suitable for any yacht or motorboat.

Understand

The Archipelago Sea is a maze of islands and islets.

The Archipelago Sea is a maze of islands and islets, having more of them than any other archipelago on earth, if tiny ones are also counted. As such it provides varying landscapes and seascapes and nice sailing in mostly sheltered waters. But navigation can be challenging for those used to more open waters, and thus following a well marked fairway makes sense. For the same reason, you should anticipate slowing down at any especially challenging stretches.

Marina of Högsåra

There are many guest harbours by the route. Landing on any island you think looks nice is allowed, as long as you avoid protected areas, shores with cottages, and islands with nesting seafowl. Using a quay or jetty usually requires permission (so mainly use those of guest harbours). When you use your anchor, mind possible underwater cables, noted on the charts and usually marked with signs and specific leading line marks.

There are many fairways criss-crossing the archipelago and additional non-marked navigable routes, so deviating from the itinerary is certainly possible and encouraged. This itinerary is meant to provide a low-threshold first approach.

For distances this article uses nautical miles and the abbreviation M (1 M=1.852 km, ca 2 km; 1.151 mi). The fairways of the main route have a (nominal) depth of at least 2.4 m, while some alternative routes and suggested sidetrips have a depth of 2.1 or 1.5 m (usually noted). For harbours, do always check. There should be no bridges on the main route; bridges on suggested alternative routes should be noted in the descriptions.

There are two main boating routes through the Archipelago Sea, one going kind of straight, more or less keeping to the inner archipelago, another going around the main islands through more open waters. The fork is at Purunpää just west of the Kimitoön main island and the fairways rejoin north of Iniö, just before Kustavi. Both are described below.

The inner, eastern, route is about 100 M (180 km, 110 mi), not counting port visits or sidetrips. The outer, western, route is a tad longer, at about 120 M (220 km, 135 mi). With 4 hr daily sailing + sidetrips and harbour visits, the trip thus takes about a week with 4 knots effective speed. With a fast boat or less time on land a few days could be reasonable; less than that would mean your just speeding through.

Talk

Much of the area is traditionally Swedish-speaking, although there now is a large Finnish-speaking minority. Rymättylä, Velkua, Kustavi and Uusikaupunki are Finnish-speaking, although you can find traces of Swedish in some place names.

As many of the inhabitants of the archipelago have been involved in shipping and fishing, traditionally "learning to row before learning to walk" as somebody put it, shipping authorities are usually fluent in all of Finnish, Swedish and English. In the yachting community Swedish speakers are likewise over-represented, although probably still a minority.

The word fjärd (Finnish: selkä) is common in names and denotes an open water area, in contrast to more sheltered and narrow sounds.

There are many words for different kinds of islands, although with the postglacial rebound and other factors, they are sometimes misnomers. Land is a large island, often with the parish village. Ö is a smaller but still large island. Holme is still smaller, but big enough to have arable land. Skär is a low island, sometimes a group of skerries. Båda, klobb and kobbe are mostly just cliffs, grund is a shallow, sometimes a minor island.

See

The main attractions on the route are the seascapes, endlessly varied. The Archipelago Sea also has a rich birdlife, with terns and gulls; eiders, goldeneyes and mergansers; white-tailed eagles and ospreys; and many more. Many of the guest harbours are at archipelago villages that have survived the urban development.

Buy

Hanko, Dalsbruk, Pargas, Turku, Nagu Kyrbacken, Naantali, Iniö Norrby, Velkua, Kustavi and Uusikaupunki all have at least a grocery store, most of them a selection of shops, including for souvenirs. Most also have repair facilities at least nearby. Harbour masters should be able to give advice on any special needs.

Fuel is nowadays rare in marinas without road connection. There are still several marinas on the route that have fuel, mostly on the mainland or main islands.

Prepare

Island with navigational aids, including a sector light and a leading line

See also: Archipelago Sea, Boating in Finland

You will need a vessel. Yachts and smaller motorboats can be chartered at several locations. See Archipelago Sea#By yacht and small boats for a few businesses. Sea kayaks (and canoes) are also available and a nice way to experience the archipelago, but with those you should mostly keep off fairways.

A boat for archipelagos (class C on the A–D scale, i.e. between "coastal" and "sheltered waters only") should be sufficient in most scenarios. The waters along the eastern fork are mostly sheltered, so any boat can be used if you check weather and weather forecasts and can afford to wait out bad weather.

No official qualifications are needed for skippering boats shorter than 24 m (sic!), only "sufficient age and skill", at least 15 years of age for a yacht, 18 years for anything big or fast, to be on the safe side. You do need a radio licence (such as the SRC) if the boat has a marine VHF radio. If you are less experienced, you should make sure you follow marine weather forecasts regularly (section Archipelago Sea) and respect any warnings. Choose moorings where you can wait out bad weather, and plan for the wind turning during the night. (More experienced sailors will have adequate routines.)

As the archipelago is a maze, you will need good big-scale charts. The leisure craft chart series B (Helsinki–Pargas; needed east of Kasnäs) and D (Archipelago Sea) and an overview chart should be a good choice. Even if you use electronic charts and have good backup systems this €100 investment is probably worthwhile. A major problem with electronic charts is the lack of a chart-size screen on most boats – the charts are full of essential small details, while you still need an overview.

As the sun sets late most of the season, there is little need to sail in the dark. If you choose to do that you will need a spotlight and good compass handling nearly anywhere, and especially in the lesser fairways. Unless well acquainted to night sailing, keep to the light hours.

The Finnish charts and navigation aids use INT A (green marks on starboard when entering a harbour) with minor deviations, and EUREF-FIN, in practice equivalent to WGS84. Leading lines and cardinal marks are used extensively, also large fixed edge marks up to 50 m off the fairway (distance given on the chart). Top marks are seldom used, despite the symbols on the chart. Lateral marks are used on some stretches, and with those you should take care checking the direction, which is not always obvious and can change when passing a hidden harbour. Also sector lights are used. Most marks have either lights or reflective bands, which can be seen with a spotlight when you are close. Check these on the chart symbol explanation pages, and make sure you know how to use the associated navigation techniques.

The Finnish lights traditionally use the number of flashes as distinguishing feature; duration is seldom important.

Cardinal and lateral marks for this route do not have lights, except on the several stretches shared with shipping fairways. On those, the marks are often sturdy ice buoys. On some stretches there is a parallel shipping fairway, which you can use in the dark; the boating fairway is often a shortcut or more interesting. There are sector lights and leading lights also along some parts of the boating fairway. Small fairways may be needed for the last miles to marinas, and these seldom have any lights.

Especially if venturing off the itinerary, a harbour book is handy. The main choices are the semi-official Käyntisatamat-Besökshamnar (€23 for the volume on the coast and coastal archipelagos) and the sturdier and more thorough Great Harbour Book (ca €70 per volume) by a local sea scout troop. There is a bilingual (Finnish-English) volume on the Archipelago Sea; the volumes on the Gulf of Finland and Åland and the international volume covering even some harbours in Sweden and Estonia might also be of interest.

Although you probably don't need Notices to Mariners proper, you might want to check warnings that might affect you, such as through a map-based interface. The notices are trilingual.

You need basic safety equipment, such as life vests, anchor, pump and fire extinguisher. You will also want a means to cook your food (most yachts have a kitchenette), and berths. If you rely on a tent and lodging, you may want to call harbours to ask for advice beforehand, or just use natural harbours, with some need to use trial and error, and to have a good understanding of how to check that a mooring is safe.

Check marine weather forecasts and find a reliable means to get updates on the journey. The official ones are by the Finnish meteorological institute (Ilmatieteen laitos), broadcast on FM radio in Finnish and Swedish several times daily, on marine VHF twice daily (check Turku radio local working frequencies), probably also on Navtex. The Archipelago Sea is treated as one unit, although the conditions vary considerably, with sheltered and unsheltered areas, and winds much stronger in the former. The forecasts are also available on the web: in traditional form, for smartphones, and as a map.

Get in

Seaside villas in Hanko

Hanko and Uusikaupunki are reasonably well-connected and you should be able to charter a boat in both, but you might have to make arrangements in advance. If you arrive with own yacht, or from elsewhere, check also Boating on the Baltic Sea.

If coming from Åland, the most common options are the fairways east from Mariehamn and south of Sottunga, either via Kökar and east of Berghamn of Houtskär or directly via Jungfruskär, and join the itinerary on the leg from Korpo to Skiftet. You could also come via Brändö and join at the leg from Skiftet to Iniö. For more sailing you could go Skiftet–Iniö–Nagu–Hanko or Skiftet–Korpo–Purunpää–Nagu–Uusikaupunki or, if you are coming via Brändö, join the itinerary off Uusikaupunki.

From the Baltic Sea, you could come via Mariehamn or Kökar and continue as above, or via Utö and Lohm off Korpoström or Berghamn of Nagu (on Gullkrona to Korpo), or via Utö and Högsåra or Rosala (west and south of Kasnäs, respectively).

Turku, the main city of Finland Proper, is also reasonably close, in the middle of the itinerary. To join it off Nagu, you can use the big fairways over Erstan (Airisto), just keep clear of the large cruise ferries and freighters that share them with you – most of the distance there is plenty of water for doing so.

Nagu, Dalsbruk and Kasnäs are reachable by coach or car and you could probably charter a vessel also there, for sailing part of the itinerary.

Sail

The itinerary could be sailed either way. Here it is described from Hanko.

Hanko to Kasnäs

View to the inner archipelago from the Hanko peninsula

The Hanko peninsula projects out of the archipelago to the open sea, marking the end of the Gulf of Finland. If you start east of the peninsula, such as from 1 Hanko's more busy eastern marina, you have to cross the freighter lanes. Keep good track on what sea marks pertain to your fairway.

One sight is the Hauensuoli (Gäddtarmen) sound just off the peninsula, where people waiting for good winds used to carve their names (and more) onto the rock, including nobles in medieval times.

Soon after the peninsula you cross a shipping lane, turning parallel with the boating fairway, with a fork northward to 1 Salo (1.9 m on the last leg) via Finnby (Särkisalo), Mathildedal and Tykö (Teijo), with the 2 Teijo National Park, and to the inner fairway via Dalsbruk, a possible alternative route. A sidetrip to 3 Västanfjärd is possible. 2 Dalsbruk has a big marina, an ironwork history and some cultural activities, such as the Baltic Jazz festival. It is one of the more urban centres of Kimitoön.

The sea west of the peninsula, "Hangö västra (fjärd)", is quite open with small rocks distributed quite evenly all around, some below the surface. Keep to the fairway, marked with pairs of lateral marks, unless you really know what you are doing. Here you cross the border to Finland Proper and the municipality of Kimitoön, comprising much of the eastern Archipelago Sea, and you pay a short visit to the eastern corner of the Archipelago Sea National Park.

The fairway then joins the shipping lane and reaches more sheltered areas with Vänoxa to the north and soon Hitis and Rosala to the south. Hitis and Rosala are island communities, 3 Hitis with a well preserved village milieu, 4 Rosala with a Viking centre and tours to the 4 Bengtskär lighthouse in the outermost archipelago. The fairway via Dalsbruk joins the itinerary near Hitis.

The fairway towards Rosala continues to 5 Örö at the border to the outer archipelago, with tour boat connection from Kasnäs and a view to Bengtskär. The island was a military area with coastal artillery, but now is part of the Archipelago Sea National Park.

There are no official fairways farther to the south, although both the marine and local freighters have their own ones out to the sea. The official fairways to the sea lead east to Hanko or west via Utö.

By Rosala the itinerary turns north-west towards Kasnäs, more or less by the border to the national park.

Also 5 Kasnäs has a big marina. There is a ferry harbour for some of the island communities, such as Hitis, Rosala, Vänö and Tunnhamn. The village is best known for the modern spa hotel and associated services.

Kasnäs to Purunpää

Farmors café on Högsåra

At Kasnäs you reach the areas covered by the Archipelago Sea chart series.

From Kasnäs the fairway continues north with big islands sheltering the route from the more open archipelago. On this stretch sector lights are heavily used. You pass the Högsåra ferry, and could make a landfall at the 6 Högsåra marina, take a walk by the meadows and take a coffee at Farmors café.

By Högsåra there is also a 7 M fairway (3.2 m) to Dalsbruk, for a sidetrip from here. There is another one (2.4 m) a bit to the north, which may be suitable as shortcut when continuing from Dalsbruk. Both pass under the Lövö bridge (for the road to Kasnäs). The northern fairway allows you to make a sidetrip to the 1 Söderlångvik manor (no official fairway, but reasonably well sounded; 3 M from the main itinerary).

At the island Purunpää the fairway forks. Continuing northward you follow the inner, more sheltered route. The western route leads through the more open southern parts of the Archipelago Sea, via Korpo and Houtskär to Skiftet towards Åland. The routes rejoin north of Iniö.

Inner route

Purunpää to Nagu

Ferry and marina at Pargas port

You now have Gullkrona fjärd to your west, behind minor islands. It is a symbol of all the outer Archipelago Sea.

You could take a sidetrip along the western fork to Helsingholmen 4 M away, unless there are strong winds. See the outer route.

Also using the main itinerary, you have a 7.5 M-stretch ahead not well sheltered for the common westerly winds. You have leading lights, sector lights and some cardinal marks with lights. Then you enter the sound leading to Pargas. The narrowest passage, a nautical mile ahead, is known as 7 Pargas port ("gate to Pargas"). There is a restaurant here. Ahead is a section without lights.

After a few nautical miles the itinerary turns west (1 fairway fork) while the fairway to Pargas continues north, or rather, the shipping lane from the west turns north. The channel north has dense lateral marks. If you want to make a sidetrip to there, this is your best opportunity.

Pargas is the main town of the archipelago, although small. The 8 Pargas marina is as close to the centre as one can get, and you have hotel, restaurants, cafés etc. in reach. The nearby grocery store is small, you might want to take a trip with your dinghy (if you have one; height restriction 2.2 m?) through the nice sound to its northern end, where you have the supermarkets.

Turning west, you are following the shipping fairway from Pargas. The channel has cardinal marks with lights and some sector lights. If you made the sidetrip, you can take a shortcut without lights to the south-west (depth 2.1 m), unless the 2 drawbridge at that end of Kyrkfjärden hinders you. There have been problems, and if it is out of order the passing height is 6 m (check Notices to Mariners). If you cannot pass, you have to return the 7 M to the turn westward (or, with depth max 1.5 and height max 15 m, sail east, then north and west, via 6 Vapparn to Erstan, to rejoin the route by Haverö or Själö, or west of Rymättylä having sailed through some of its sounds).

7 M after turning west you reach the fairway northward to 1 Turku over 7 Erstan (Finnish: Airisto). You could take a sidetrip to the 8 Airisto Strand marina 1.5 M towards Turku, on the west end of Stormälö. If you do, you could use the fairway west from there, over the south part of Erstan, with a maze of navigational aids. With northerly and north-easterly winds the stretch is unsheltered, but those winds are uncommon.

The itinerary passes south of Haverö. At the point where you make your choice you pass the ferry between Pargas and Nagu, and if you turn west, the 3 ferry to Haverö. After Haverö there are some very steep islands, making winds unstable. You then continue west between Svartö and Själö. This leg is without lights. In the evening you may prefer to overnight at Airisto Strand, or go via the bigger fairways over Erstan. The passage from there to Nagu, by Själö's western shore, has lights. In the day you could also take the shortcut south of Käldö, reaching the Kyrkbacken marina from the east.

Unless you opt for the shortcut, you pass 2 Själö, an island well worth a visit. There used to be a leper hospital and later a mental hospital for women, from neither the patients would return. Now the island hosts a biological research station and is an important tourist destination. The guest jetties are on the eastern side while there is a ferry quay on the west side, by the channel with the Utterberg light.

The 9 Nagu marina at Kyrkbacken to the south is the largest in the Archipelago Sea. If you came via Själö you will sail west of Kaiplot.

Chamber music concert in the church of Nagu

Kyrbacken is the parish village of Nagu, with the bustling marina, a medieval church, a local shipping museum, a beach, restaurants, grocery stores etc.

Nagu to Iniö

Velkua church, by the shore

From Nagu the fairway leads to the north, by the Finnish speaking Rymättylä. First you cross Ominaisfjärden (Finnish: Ominaistenselkä), with a maze of fairways, including the shipping and cruise ferry lanes to Turku and Naantali.

North of Ominaisfjärden the fairway keeps a steady course north-northwest. No lights here; to get lights you have to take the 10-m fairway to the north-west from Ominaisfjärden, directly towards Heponiemi. On that fairway you mostly have leading lights.

When the 5.5-m fairway turns west-northwest after Iso Maisaari you could make a sidetrip to the 9 Röölä marina. If you feel like going to Turku, you can also use the narrow sounds by Röölä to get to Erstan. If visiting the Röölä marina, you then probably need to backtrack, as the bridge east of Röölä is just 2.4 m. The bridge on the south fairway is 16 m high.

The city of Turku has a few recreation areas on islands of Rymättylä. One of then is on 10 Iso Maisaari (Majsor). Take the 2.4 m fairway north of the island. There is no fairway all the way, so keep your distance to the shallows by yourself.

The fairway turns north again between Pakinainen and Ruotslainen. Here is a second of the recreations islands, 11 Pähkinäinen (Pähkinäis), 1.5 M to the south-west. Most of it and much of the archipelago all the way from Själö is a Natura 2000 area, and part of Pähkinäinen is a nature reserve.

7 M after the turn (or the sidetrip) you reach Palva, with the (former) parish village of 12 Velkua. From here there is a 2.1 m fairway eastward via 10 Merimasku to 3 Naantali, would you be inclined to visit that town (the fairway directly from Turku has an 11-m bridge, the one at Merimasku is 16.5 m).

After Velkua you turn west over Länsiaukku, again a less sheltered area. To the north is Kustavi. A 2.4 fairway leads to the south-west to 13 Iniö, also once an independent municipality, the smallest such in Finland except Åland in the 1990s. On that stretch you have some lights, but the channel is narrow and mostly marked with lateral marks without lights.

Outer route

The outer routes leads over more open waters, not suitable for boats for sheltered waters ("D"). Still, you will seldom see the horizon. The itinerary keeps close to the larger islands.

Purunpää to Gullkrona

Helsingholmen guest harbour, with the jakt Eugenia

Before Purunpää there is an opening between the islands to Gullkrona fjärd, and the outer route leads north-west via 14 Helsingholmen 4 M away. The harbour is in a bay on the north side, use the 2.4 m fairway to get there, otherwise there is a narrow passage by its south-west shore.

Helsingholmen has a nice guest harbour, sheltered but for north-easterly to easterly winds. If you are continuing towards Pargas you can turn to the north-east between Sandön and Södergrunden, take the 7,5-m fairway north after Helsingholmen and turn north-east for Pargas port, or continue via Gullkrona.

From Helsingholm the route continues to the north-west towards 15 Gullkrona, a further 7 M to north-west. The area around Gullkrona and Gullkrona itself is a maze of islands and islets; the fairways are well marked, but by sail you may have to plan your manœuvres well. There is a small sea pilot museum on the island. The harbour is now commercially run.

If this was just a sidetrip you can sail north partly along a "boating route" instead of a proper fairway, or north-east and north, also joining the inner route in inner archipelago, or north-east and east to join it before Pargas port.

Gullkrona to Korpo

The Gullkrona village

The boating route continues westward, with 16 Brännskär 3 M ahead. The island is nowadays owned by a foundation for keeping the archipelago inhabited. The family living there keeps a guest harbour and cottages besides handicraft and other work.

The boating route turns south-west, then west. Another more sheltered fairway (4.3 m) leads to the north-west. 4–5 M after Brännskär, after crossing Haraskärsfjärden, you reach 17 Berghamn of Nagu (there is another island by the name in Houtskär). Also here the channel to the harbour is a bit tricky.

The 4.3-m fairway northward leads to Nagu Kyrkbacken and Erstan.

If you turn to the 4.0-m fairway to the south-west on Haraskärsfjärden and continue over Ådöfjärden you reach 11 Nötö. Fairways from here go to 12 Jurmo and 13 Utö. The itinerary keeps closer to the main islands.

The itinerary continues west over Barskärsfjärden, crossing a 10-m fairway north, leading between Nagu and 4 Korpo towards Ominaisfjärden. If you are going to Korpoström, you could use this fairway and then the one through the Korpoström strait between Rumar and Kait. You can also follow the outer fairway, which turns north to the other end of the strait.

18 Korpoström has fuel, coach connection to Turku, restaurant, and events and exhibitions of the "archipelago centre" (Skärgårdscentret).

The fairway still continues to the west and then turns north, passing the Gyltö restricted area and shooting range (there is a coastal artillery base here). A 2.4-m fairway leads to the 19 Verkan guest harbour, with restaurant (Buffalo), near the parish village of Korpo.

Korpo to Skiftet

Jungfruskär pastures

The main boating fairway turns north-west and west-northwest over Lövskärsfjärden, crossing the 13.0-m fairway to Turku and Naantali, used also by the big cruise ferries from Stockholm, and then past Houtskär's Berghamn. This is probably where those coming via 14 Kökar join the itinerary.

You could take the 3.0-m fairway westward over Österfjärden to 15 Jungfruskär, which is a lush island, where the trees are still cut in a peculiar way, traditionally to ease harvesting of leaves as winter fodder. The island belongs to the Archipelago Sea National Park. The name Österfjärden (öst=east) hints that this area was once thought to be part of Åland. After a sidetrip to here you have to backtrack; there is no fairway to the north-east, and you should probably not take a shortcut. If you are coming from Åland, this may be where you join the itinerary.

The fairway rounds Fiskö and turns to north-northeast. This was the glimpse you got of Skiftet between Åland and "mainland" Finland – unless you continue north-west to 5 Brändö. If you do, you can take either fairway from the 4 Snöbådan lighthouse, to north-west for 16 Lappo or north for 17 Torsholma.

Skiftet to Iniö

Iniö centre

If you did visit Brändö, you will probably return to the main boating fairway by one of the fairways by 5 Nåtö to Iniö.

The main boating fairway circles Houtskär, turning mostly north-east. After Hyppeis you have an option of a 2·5 M sidetrip to 20 Näsby, the parish village. A bit farther you could moor at 21 Björköby, which used to be a big village with grocery store (which might get revived). The village has maintained much of its traditional character.

Then you pass Nordanlands, better known as 22 Mossala. The guest harbour is where the Archipelago Trail ferries for Iniö leave. Mossalafjärden has a peculiar shape, caused by a volcanic intrusion nearly two billion years ago.

The fairway continues zigzagging to the north and passes between Keistiö and the main island of Iniö. A 2.4-m fairway leads north toward 6 Kupmo and north-east and south-east to the main village Norrby. The main fairway circles the main islands to the west and then leads to the north-east to Heponiemi. If you go via Norrby you can continue between Kolko and Hepmo and then north to Heponiemi. The outer fork of the itinerary joins the inner one off the peninsula.

Iniö to Uusikaupunki

Off Uusikaupunki

The forks rejoin off 7 Heponiemi ferry harbour, with the ferry port for Iniö. Short stays are possible by the ferry quay and there is a guest marina, 23 Peterzéns, a little further. From here the fairway goes north-west through the sound between Vartsala and Kustavi main island, without lights. The 24 Lootholma marina is 2 km south of the parish village. Closer to the parish village is a guest jetty near the 25 Kivimaa road ferry quay, where shorter visits are allowed. For motorboats also the 26 guest jetty close to the centre is possible (continue east of Lootholma and through a narrow sound northward). The fairway continues between Lypyrtti (Swedish: Lypertö, showing the movements of the language border) and Kaurissalo. 27 Pleikilä on Kaurissalo has the last guest jetty (for short visits; in between the islands with marks and leading lights) before briefly getting out on the Bothnian Sea (still with some archipelago, though) before turning to Uusikaupunki. You can make a short sidetrip to the former coastal fort 18 Katanpää in the Bothnian Sea National Park (restaurant, café, sauna and other services, beside the natural and man-made sights). Look out for changing weather, as there is little shelter off Katanpää.

On the unsheltered leg you first have some lights. Soon you will soon turn in among islets and rocks with leading lights ahead. You then have sector lights until you reach the bigger fairways to Uusikaupunki.

You could choose to follow the fairway for one more stretch with a leading line at Putsaari and turn to the 4.5-m fairway when reaching the 10.0-m one. This is a little easier to navigate than the 3.2-m shortcut, which is certainly challenging in the night.

Regardless, sail by Humalainen and Nuhja (south of the 8 Hanko island, namesake of the city), joining the 8,5-m fairway for a while, to get to the 28 Uusikaupunki marina.

Stay safe

View from Helsingholmen

Make sure you have the boating and navigation skills needed, that your vessel is seaworthy and that you have proper large-scale sea charts. Have a means of getting sea weather forecasts. Don't sail in dark hours unless you know you can handle it.

Beware of ships in the major fairways, including the large and fast cruise ferries on Ominaisfjärden and Erstan. These are mostly restricted to the fairway itself and therefore cannot safely change course, and will often not see you when you are close.

Keep a keen watch. When sailing, other boats are often hidden by your sails, and with a motorboat the time between another boat becoming visible and your passing (or crashing into) them is surprisingly short. Such collisions in good visibility are all too common. Also mind paddlers, swimmers and birds, especially birds with offspring. If using GPS and autopilot, mind that other boaters might use exactly the same waypoints, getting on a countercourse even if there is plenty of room around.

Water is cool and the shore is often surprisingly distant once you find yourself in the water. Stay on board and wear life jackets. Also the rocky shore and the quay are dangerous, especially for children.

Keep in contact with your friends on shore, to avoid them thinking you have got in trouble. If you cannot reach them, rather call 112 to tell them you are belated than have your friends call them to start a rescue operation.

Respect

• Keep your distance to waterfowl with chicks.
• Empty your septic tank in marinas with emptying facilities.
• Don't make waves close to a sailing boat when the sea is calm.

Go next

After this introduction, you will probably want to spend the next summer exploring the Archipelago Sea. For now you could continue north to the Bothnian Sea National Park, circle Åland counterclockwise through waters with few other boaters and finally reach Mariehamn, with an interesting maritime history – or just explore the coastal cities, such as Uusikaupunki and Rauma.

From Hanko you could join Helsinki folks returning from their vacation in the Archipelago Sea, for some more archipelago sailing, perhaps including the Ekenäs Archipelago National Park and the Barösund strait, or sail back through the southern, more open parts of the Archipelago Sea, to Utö and then over the open sea to Gotland.