Doppler effect on a marine
gps, what make it? I am a old guy. I was taught a gps measures a time differential between receiver and satellite
. After it requires re than one satellite it can calculate position, using time between positions it calculates speed. The more satellites it tracks and the faster it process the more accurate the position. Since the earth is no actually round it has additional calculations to give you true position.
Doppler effect gives a frequency if you are moving closer or farther from a satellite. At 5kt it would require some pretty slick electronics
When out sailing I watch speed log for changes in to sail trim.
PS I use a Garmin
76s if I sit it on a picnic table speed will be shown in 1/10 units.
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