Press menu twice to get to main menu. Scroll down to setup tab. Scroll right to units tab ( units tab does not appear on screen until you scroll far enough to the right) then scroll down to distance and speed and choose stature mile.
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49 knots=56.388193 miles per hour
439 knots=505.192178 miles per hour
11 knots=12.6585739 miles per hour
40 knots=46.0311779 miles per hour
36 knots=41.4280601 miles per hour