Thanks, confirms my suspicions.,
My 500 distance display doesnt update sometimes while on the trainer. I just stop it and reset to zero and it usually comes right.
First question, why turn the GPS module off , if its because of Strava then use the security features with in strava to hide your position. Assuming you have installed the cadence / speed sensor try the following Go to settings, bike settings,bike profiles, bike no, wheel size & recheck (custom probaly 2096mm), back, ant + speed/cadence,(bike sensors should say "yes", if you clickon sensor details it will display sensor ID's, if not rescan next to the bike. i leave the GPS on and the unit will switch automatically from GPS mode to the sensors when they are detected
With regard to heart rate monitor, i always have the strap on before turning garmin 800 on, that way i always see the connection between the unit and heart rate monitor, (a screen pops up showing connection)
also you said you have checked battery, have you checked both, speed/cadence sensor & heart rate, need to check both, they are linked.
Otherwise as Gus says sounds like a warranty issue, nothing more frustrating
Thanks Brett, tried again on Sunday without turning GPS off and worked fine. Simple things often work wonders and as I have been so used to "auto start" with the GPS turned on that I hadnt manually started the timer. Using this useful button on my lastest indoor session provided me with the distance measurement I had been missing!!!
WRT heart rate, I followed DC Rainmakers advice and connected the Garmin transponder to the Polar "Wearlink" strap and Hey Presto! heart rate readings as well!!