I totally agree with Stephen about the GPS vs. Compass, and use a GPS constantly on my M15 -- the only thing I'd like to say is this: I know that there ARE certain weather conditions when a GPS does not work -- and they happen typically to be exactly the conditions when you may not be able to navigate by sight.  So don't throw the compass away unless you only go out for short trips in clear weather.
 
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Steve McClellan M15 #152 Chicago, IL