GPS Communication Software. Mapping Program. Tarpits and Tips. Tools of the Trade . GPS. Tools of the Trade - Part IV. Tarpits and Tips. TIPS. Outline. Datums Error, Accuracy, and Precision Map Scale and Errors Tips for Managing GPS Error Better Maps for GPS. GPS Datum Tarpit.
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Tarpits and Tips
400 feet off
Display set to NAD27
They Expect WGS84
Set Projection in DNR Garmin to NAD27
Always Stores in WGS84
Working in NAD27
Aviation GPS is always WGS84
Kenneth E. Foote and Donald J. Huebner, The Geographer's Craft Project, Department of Geography, The University of Colorado at Boulder.
1.) Accuracy: how close to truth or accepted values.
2) Precision: how repeatable or consistent
Accurate + Precise
= Low Error !
3.) Error: includes both the imprecision of data and its inaccuracies
Mapsource data is 1:100,000 scale
+/-26 ' (open)