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"Brent Sullivan "PQ""
> OK Doug and Ron, what the heck IS that N, S, E, W thingy with numbers
> 1-360 that looks just like a compass in my Garmin12XL? Curiously, the
> manual refers to it as the "Compass Page". Maybe your GPS doesnt have
> compass but perhaps other models do, no?
The problem is that a compass rose, does not imply the existence of a
compass. The GPS measures movement in this case by actually looking at the
instantaneous change in the clock data. You can actually resolve
movement at a mSec timescale, and with better instantaneous accuracy than
the unit possesses (in a positional sense). This data allows the speed and
movement to be calculated in very short timescales, and this data is
displayed in a manner reminiscent to the traditional compass, but has
been allready explained, reflects the actual surface movement (which is of
course still relative to a compass direction), but not the compass
direction, in the purely static sense.
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