gps to measure feet?

Does anyone know the exact conversion in feet for a minute of latitude and
longitude?

I find this on the web:

Latitude: 3.64 feet per 0.00001 degree, 6.06 feet per 0.001 minute,
10.10 feet per 0.1 second, 101.1 feet per second, 6066.7 feet per
minute.
Longitude: 3.04 feet per 0.00001 degree, 5.07 feet per 0.001 minute,
8.45 feet per 0.1 second, 84.5 feet per second, 5066.7 feet per
minute.

But I am scratching my head over the longitude! Doesn't a minute of
longitude depend on your location between the pole and the equator?

all the best -- Dan Ford
email: (put Cubdriver in subject line)

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