WatchMate® AIS Data Transmission

AIS data transmission from vessels at a variety of rates. Class A ships send position updates every 2 - 10 seconds depending on their speed and rate of turn, or every 3 minutes when reporting as anchored or moored and not moving faster than 3 knots. Class B ships send position reports every 30 seconds when traveling faster than 2 knots; otherwise, it drops back to every 3 minutes. Information that doesn't frequently change, such as the vessel's name, size, and voyage information, is sent every 6 minutes for Class A and B.

The WatchMate® continuously updates bearing, range, CPA, and TCPA for every vessel whenever a new position is received and whenever the boat moves. In addition, the WatchMate displays the time that has elapsed since each ship has sent its last update. Helpful information to determine the currency and accuracy of the data presented.