In reply to Indy:
> GC doesn't crash for me and I've had no issues with routes sent to any devices authored on GC.
> If your 500 isn't getting a good signal then it's going get confused. Have you checked the accuracy? on most Garmin's I've seen theres a way to see its current accuracy.
You can view the GPS accuracy but some of the places I've been having problems have been high up on table flat moorland in clear sunny weather with nothing anywhere near me so if it can't get a good signal there it's not going to work anywhere.
It just stops working, the line to follow disappears and then 30 seconds later (20 seconds after I've started cycling in the wrong direction) it reappears.
When I put these routes on strava or back on to garmin connect they show the routes plotted perfecty, so no issue with the GPS signal shown there.
Irritatingly, I was going to get the 200 which a few of my friends use and have found faultless but I chose the 500 because I wanted the cadence sensor to try and encourage me to keep a knee friendly cadence, and I've yet to even fit the sensor on the bike.