Garmin Edge 510 erratic 'grade' readings
When I first bought this 18 months ago the grade was a useful feature. Then after a few months, it started to become very erratic, jumping around from for example +2.4% to -3% when the grade wasn't really changing much, thus rendering this feature fairly useless. It continued like this and is still the same now, so cannot be due to atmospheric conditions, which I have seen as a possible reason. Has anyone else had this problem and is it fixable? It would be a good function if it worked!