It is located in the western part of the town on the sea on Hamngatan, about 1 km (0.62 mi) at the other end of Storagatan.

The foremost exhibit is a four-masted barque named Pommern, built in Glasgow in 1903, which is anchored behind the museum.

[5][7][8] The museum created the central core of a ship depicting a mast, saloon, galley and cabins.

It is the centrepiece of the museum since 1957 at its present mooring in the western harbour of Mariehamn, after sailing for over 70 years.

[3][5][16] Cabinets in the museum display curios collected by the sailors from different lands; including piranhas and sharks’ jaws, shells and corals.