Compasses
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From our buying guide
Ritchie says a magnetic compass needs no electrical power to work, and that a GPS gives course over ground, not heading. Magnets, ferrous metals and current-carrying devices near it can cause deviation, so the spot matters too.
Check before you buy:
- It's balanced for where you boat. Ritchie advises buying the zone central to where you boat.
- The dial suits your helm. A flat card is read from above, and a direct-read dial from directly in front.
- You can compensate it, since not every compass has built-in compensators.