The forerunner 101 would be my choice as well. I had an Etrax (now at the bottom of the pond) which was fairly large and heavy and I am sure had an influence on the boats performance especially in a smaller hull.
If you will use your GPS for lots of other functions as I do, you may want
to look at the Garmin Foretrex 201... Small size, internal LiOn battery pack
and serial output to computer... It is WAAS enabled for best accuracy
I like the Forerunner because it has a feature to set the "resting speed". When you are at or below the resting speed, then that data is not included in the run time data for things like distance traveled and average speed.
You can set the "resting speed" to something like 25mph - the it will ignore the time spent walking to the water and motoring out to the race course as part of average speed or distance traveled for the run. By not including "resting" time it makes average speed more useful in tuning a boat.
I imagine the same feature is on the ForeTrex 201 as well.
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