Okay, I went into a long tunnel tis weekend (Blackwall Tunnel and then Limehouse tunnel) and noticed that my speed had dropped off to zero, presumably because I was in a tunnel and a GPS lock wasn't possible.
But I have a Garmin speed sensor fitted, so was expecting that sensor to be used in preference to the GPS, so a couple of questions;
1. How can I tell if the sensor is being used to calculate the speed rather than the GPS (anything in the datafiles?)
2 Is there a way to force the first place to be consulted for speed, to be the sensor rather than the GPS ?
Thanks