What I found was this.
1: GPS reception on the 500 is not as good as the larger hand held units. This is because of the physical size and there not being enough room to put a bigger antenna in. As a result the unit will from time to time skip a beat or go ofcourse slightly when the fix becomes weaker.
2: It WILL use the gsc10 for Speed/Distance and Cadence when it is paired and a wheel size is selected.
3: In auto select for the wheel size it might from time to time "Hick up" and try to recalculate the wheel size (this might be due to a bad GPS fix) and the chances are the wheel size will be slightly different.
4: There is a button on the GSC10 when you push this button it will flash green every time the wheel magnet passes by and red everytime the crank magnet passes.
5: I am an idiot and didn't settup my GSC10 correctly.


















