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GPS Anchor Alarms
EA,
There is a fair amount of accuracy/repeatability difference between GPS with selective availability off and WAAS. Have a look at this URL an I think you will agree.
http://www.raymarine.com/recreational/latest/index.html
The graph was origianlly built as part of the (former parent company Raytheon) work with the FAA on WAAS.
The Garmin line of GPS receivers is/has gone exclusively to WAAS.
Wayne
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