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Re: Fixes consistantly south and west of GPS
From: Paul Hirose
Date: 2014 Nov 15, 15:16 -0800
From: Paul Hirose
Date: 2014 Nov 15, 15:16 -0800
On 2014-11-15 13:06, Randall Morrow wrote: > I don't think the fix has ever been to the east or north. That is an extraordinary bias. What was the datum setting in your GPS receiver when you measured your observing position? I assume you have verified the coordinates a few times. Are you interpreting the GPS readout properly? Not to insult your intelligence, but lat/lon is vulnerable to blunders due to the three flavors in use (D.d, DM.m, and DMS.s). However, I think the most likely explanation is a systematic error in your observation or reduction technique, combined with an unbalanced set of azimuths (perhaps due to visibility constraints at your site). For instance, from my porch I can observe only west of the meridian. If I always measure altitudes too high, my fixes will always fall west of the true position.
