Originally Posted by
jgwilliams
I'm wondering if anyone else has had issue with combined speed/cadence sensors on Garmin GPS units?...
There are many of these sensors out there. I haven't heard of problems.
Originally Posted by
jgwilliams
...and I can confirm that the speed sensor itself is working as it operates a diagnostic LED for the first x number of pulses,...
You confirm that it's working by picking the bike up and spinning the wheel and seeing the speed displayed.
Originally Posted by
jgwilliams
...so I have to conclude that it's something to do with the Garmin software.
There are many of these sensors out there. If was something to do with the Garmin software generally, it seems likely that lots of people would have the issue.
Since it appears they don't, one could conclude there's something wrong with your particular unit.
You could try leaving the battery out for a while and reinserting it. and seeing if that changes anything,