In my experience best to forget mounting one one the bike.I tried it myself again recently after buying one in Germany.It was great until we started moving then it was useless due to magnetism on the bike.Best thing is to put a Sylva hiking compass it the map window on your tankbag and re check bearings when the engine is switched off.Always keep a check with GPS if poss but remember one simple rule.If you don't know where you are at any time,stop and take a bearing or GPS reading,you shouldn't be moving if you don't know you location.
I have been trying to find a method of keeping track of direction without stopping for a while but the truth is I haven't managed it yet.Good luck
Roy F
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