Garmin or North Star?
#5
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#9
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? shouldnt be DD...
I believe they are all WAAS augmented GPS units they should be within a 10nth or so.
Does Gaffrig make a GPS? Or just speedometers that are GPS enabled?
They should all read within a MPH or two of one another in almost all circumstances unless a "correction factor" is enabled at the setup screen of either.
Maybe one was set to knots and the other MPH?
Uncle Dave