Probably just blocked signal. As each boat came in, I pulled them off the boat and made sure it got a final signal. The most consistent location was on the mast rotation limiter bar. The newer spot beacons have a better antanae and will transmit the last two locations in case the prior location was not uploaded via satelite.

There was also a problem with supplied black foam cases. Once they absorbed water, they would not transmit. I figured that out in one of the legs that I tried them on a few of the boats. The SPOT PR person was really shocked at that. I told him if he needs some prototypes tested, send them on.