Join Date: Jun 2001
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GPS Anchor Alarms
I agree that the GPS display resolution has nothing to do with the accuracy of an anchor drag alarm.
I thought we had digressed to discussing the value of WAAS accuracy for everyday navigation tasks. For general pilotage, I maintain that a marginal improvement in accuracy isn''t useful unless the granularity of the display will represent it.
In practice, my obsolete non-WAAS, non-DGPS anchor alarm doesn''t fire at night when I set it to .02 nautical miles, (120 feet).
It does go off every time we drive the boat away from the drop point after we pull up the hook--I always forget to turn it off--and it goes off when the boat swings, so I know it works.
If the alarm did go off spuriously, I''d just set it to 180 feet.