Having a little problem with my chart display showing my position approx 150
ft west of actual, I checked chart datum (NOAA BSB raster type) and found
it was NAD83, whereas my GPS (non-WAAS) had been set to WGS84. So just for
the heck of it I set the GPS to NAD83. That didn't correct the position
error. From what I understand, WGS84 and NAD83 are practically identical,
so is there any reason not to just leave GPS set to WGS84 (this is in SW
Florida, USA)?

Any advice on what else to check to correct the westerly error would be
appreciated. (using Capn nav software and Garmin GPS 48).

Thanks,
Len

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