I have some courses I made from history on my 305. I was out at a track the other day and I engaged the course but it was showing 5000 mi to get to the start. That wasn't right. Eventually I figured out how to show the map for the course. It had no map. I checked a bunch of my other courses they also behaved the same and also did not have maps. I had to delete them and redownload them from GTC to my 305. Also, the history they were made from was still in the 305, but just the same, did not show a map of the route. So I dumped that history as well.

Anyone know whats going on here? It was tricky to fix this. I noticed that 305 does not "synch" but I have to delete things from the 305 and from the GTC to truly get rid of them.