[BC] GPS recommendations

[Alan E. Gearing]

On 13 Jun 12 10:29 PM, Fred Morton wrote:
> To the group:
>
> My last gps evidently got tired of my company and decided to seek its pleasures elsewhere (ie, it walked off last weekend). Looking for the group's recommendations on a GPS. I'd like to be able to select NAD 27, and get degrees-minutes-seconds. Just picked up a Magellan explorist GC which is lacking, and will probably go back to Frys tomorrow. Any suggestions are welcome.

With regard to NAD27, keep in mind that according to the FCC the internal 
algorithm to convert from NAD83/WGS84 to NAD27 does not have acceptable 
accuracy.  See the footnotes to the Public Notice at the following URL:

http://transition.fcc.gov/ftp/Bureaus/Mass_Media/Databases/documents_collection/da88-316.html

Even though this Public Notice is from 1988, based on a phone conversation 
I had with the listed contact person, Donald Campbell, in April 2009 it 
still applies to "consumer" grade GPS's.  Only the professional grade GPS 
units (read costing multiple thousands of dollars) have sufficiently 
accurate internal conversion routines.

Regards,

Alan

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Alan E. Gearing
Direct: 518-392-0534