U.S. Official No. 280875
Not yet on Master's MateOR 310 is a cargo barge flying the American flag, measuring 59.5 metres. She's built with a beam measuring 10.7 metres and a 3.3 m draft. Her registration reads U.S. official number 280875. Bring OR 310 aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.
Real-time AIS, full systems telemetry, distress alerting and worldwide charts — your hull on one dashboard, from anywhere.
Put her on the dashboard — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Joining the Safety Initiative Network doesn't just put OR 310 on the map. It hands you the full bridge:
© 2026 Master’s Mate. All rights reserved.