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ContinuousWave: Small Boat Electrical
Garmin Differential GPS
|Author||Topic: Garmin Differential GPS|
posted 01-23-2008 04:26 PM ET (US)
I'm still using a Garmin 815 differential GPS, was just wondering with no selective availability in use by the government now does the unit still require a differential antenna to provide optimal accuracy. I'm guessing, it being an older unit there's probably some dependency on the differential signal within the unit's software. Goal would be to eliminate the antenna if possible. Appreciate anyone's feedback on experience with this question.
posted 01-23-2008 04:30 PM ET (US)
The accuracy of your position will have greater precision if you use the Differential GPS receiver to augment the basic GPS receiver.
If Selective Availability Mode were turned on again, would it spoil the Differential GPS correction?
posted 01-23-2008 06:57 PM ET (US)
Garmin 815? I don't remember it, Garmin's website doesn't
mention it, and Google can't find it.
GPS with SA on: about 300' accuracy.
So, yes, it still helps. But essentially all modern GPS
When WAAS came online (and Garmin nicely had a firmware
The US military has some localized disruption capability for
posted 01-24-2008 12:40 PM ET (US)
Thanks, that's about what I was thinking, the accuracy for the Long Island Sound area is very good, it will consistently find the same locations within 3 meters, have heard the differential signal is strong for the area. Chuck, you're right, how about a 215-D, and yes will be looking at the new toys at the upcoming shows.
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