I have found the automobile compasses work fairly well on my bike. Buy an adjustable one specifically made for an automobile. Mount and adjust per the instructions. Now these compasses are not made for fine navigation. The graduations on mine are something like 10 or even 20 degrees. I would not want to use them to find my way through the woods at night, but they work just fine for general direction on unknown backroads.
Regards,
John
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