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Posted by matt weber on March 28, 2010, 2:48 pm


On Sun, 28 Mar 2010 14:57:31 +0000 (UTC), Kat Rabun

>On Sun, 28 Mar 2010 10:44:46 -0400, Alan Browne wrote:
>> get better performance from units marked "WAAS" and make
>> sure that the WAAS mode is enabled (menus).
>I think the Garmin nüvi 770 is WAAS enabled according to this site:
>http://gpstekreviews.com/2008/01/02/garmin-nuvi-710-750-760-and-770-gps-auto-navigation-review/
>The review says the nüvi 770 has the SiRF Star III receiver chipset which
>is "WAAS enabled".
>However that site says that enabling WAAS isn't important because, they
>say, the accuracy of the SiRF Star III chipset is 2 meters for position
>(does that include elevation???).
>This is weird because 2 meters is about a third of the 15 feet (or so) of
>"accuracy" that the Garmin nüvi 770 reports on the display.
There are enough imponderables in the basic GPS technology that make 2
meter accuracy (90% CEP) impossible without a local differential
correction. WAAS deals with the largest of these known limitations but
it has its limitations because it is a wide area service.

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