Following the recent collisions between US Navy destroyers and merchant ships, various internet sites posted the AIS tracks of the collisions. Well, they posted half the AIS tracks anyway. The merchant ships used AIS while the Navy did not. While US Navy ships have AIS transponders onboard they do not transmit their positions nor apparently do Navy crews regularly consult the receivers showing the location and course of other ships. It was possible to track merchant ships’ courses but not the destroyers’. That now appears to be about to change. The Navy appears ready to finally switch their AIS transmitters on.
If the acronym AIS is not familiar, the Automatic Identification System (AIS) is an automatic tracking system which broadcasts a ship’s unique identification, position, course, and speed to other ships close by. AIS is required by the SOLAS (Safety of LIfe at Sea Convention) for almost all commercial ships. Use by military vessels is optional.