Hello,
We are racing with self positioning marks and their GPS coords are streamed by a server every 10 s.
I use the Expedition simple protocol to update the mark positions with:
#M,id,name,latitude,longitude,flag*XX\r\n 
It works but even if I fix the id, a new mark is created every 10 s and my course setup explode.
Is there another way to do this? I mean just updating an existing mark?

Many thanks for your help !