Thanks for the response, yes I did know that but I cannot see a way to send that back as an event different from all the other fixes coming back.
If you imaging a ship traveling in a straight line for say an hour, I have no real interest in this apart from knowing where it is and that it is moving in the right direction. What I need is to highlight it and trigger a warning on the server when it suddenly changes direction by say greater than 25 degrees?
Therefore I am looking for a way to trigger a separate message from the FMB204 when that happens.