MMSI 366304000 · Call sign WDN4450
Not yet on Master's MateGALVESTON ISLAND is an American 106-metre harbour workboat. Her hull carries a beam measuring 21 metres and a draft of 4 m. On AIS she shows as MMSI 366304000, call sign WDN4450, IMO 9952878. Working vessels like GALVESTON ISLAND are never truly alone on the Master's Mate Safety Initiative Network — free, with a fleet on watch.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Joining the Safety Initiative Network doesn't just put GALVESTON ISLAND on the map. It hands you the full bridge:
© 2026 Master’s Mate. All rights reserved.