MMSI 257234800 · Call sign JWQM
Not yet on Master's MateNIDARHOLM, a boat sailing under the Norwegian flag, measures 20 metres on deck. She's built with a beam measuring 4 metres and a 1-metre draft. On AIS she shows as MMSI 257234800, call sign JWQM. It's free to add NIDARHOLM to the Master's Mate Safety Initiative Network — like AAA for the ocean, run by the cruisers who use it.
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Joining the Safety Initiative Network doesn't just put NIDARHOLM on the map. It hands you the full bridge:
© 2026 Master’s Mate. All rights reserved.