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post #5 of Old 09-25-2001 Thread Starter
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GPS Anchor Alarms

The accuracy figures that most people use (including Garmin) are:

1. GPS with SA: 100 meters
2. GPS w/o SA: 15 meters
3. Differential GPS: 3-5 meters
4. WAAS: 2-3 meters

While 12 a meter error (a boatlength) could certainly make a difference navigating a narrow channel in very poor visibility, it is unlikely that the graphic display on a WAAS GPS would even render that level of detail.

So, for me, it''s not really an accuracy issue. I''ll buy a new GPS unit for the chartplotter and for the built-in navaid database.
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