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"Brent Sullivan "PQ"" message news:st79jnfsjino6f@corp.supernews.com... > OK Doug and Ron, what the heck IS that N, S, E, W thingy with numbers from > 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 a > 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. Best Wishes |
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