Geomari – Marine Geology Research Vessel

The research vessel Geomari is an aluminium-body catamaran operated jointly by GTK and the Finnish Navy. Geomari is mainly used for seafloor mapping and marine geology research. The demands set by operating in Finland’s shallow coastal waters have been taken into account in the vessel’s design.

Geomari has an instrumentation centre on the command deck for research purposes, as well as a wet lab, accommodation for crew, marine geological research equipment and an open 40 m2 stern. The stern features hoists and room for project-specific measuring equipment, samplers and winches.

Vessel type

Research vessel Geomari (MMSI 230985210)
Aluminium-body catamaran
Trading area III, including open sea.

Year of construction



Mobimar Oy

Length: 20 m
Width: 7.6 m
Draught 0.9 m
Gross tonnage: 75 t
Propulsion: Dual 700 hp (522 kW) Caterpillar diesel engines, a waterjet propulsion system
Accommodations: six persons

Operating range: 350 nautical miles
Cruising speed: 20 knots
Operating speed 4 knots

Survey equipment

Seismic equipment (SIG_Pulse S1 Boomer/Sparker < 1.0 kHz)
Side-scan sonar (Edgetech 4205 Tri Frequency (230 / 540 / 800 kHz)
Research sonar probe (MD 28 kHz)
Multibeam echosounder (GeoSwath4 125 kHz)
Sampling equipment for sediment sampling
Wet laboratory