3 tools
Sea and seamanship
Maritime tools that run in your browser: a COLREG lights and shapes trainer, a light characteristic decoder, offline tide predictions, compass error from the sun, a maneuvering board with CPA and TCPA, seafarer rest-hour records and port-to-port passage planning.
Sea distance between ports
A route over water between any two ports: nautical miles, passage time, fuel. Computed in your browser, with canal options and no limits.
Tide Times
High and low water times for any coastal place, a tide curve two weeks ahead and under-keel clearance. Computed in your browser, works offline.
Small-craft skipper practice test
The official EMERCOM question list — 1,221 questions with answers by vessel type and navigation area, plus a ticket in the order No. 90 format.
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