Humminbird Greg?

**Cane Pole** · 03-06-2011, 09:14 PM

You ever find out how much more accurate gps position is with 19 satellites vs 12 satellites? We chatted about this some time ago and you said you would get the answer and get back with me. I ain't forgot. I do have good recall on things of interest.

**Humminbird_Greg** · 03-07-2011, 01:28 PM

No I have not CP. In a phone conversation I was told that it would depend on where the 12 versus 19 satellites were plus their signal strength and so on… stuff we already knew. I was looking for a generalized difference of like 0.98 meters or something like that. I don’t know that I can pry that out of them.

**Cane Pole** · 03-07-2011, 02:50 PM

If you need help pulling teeth, let me know. I just got a new hook remover. I believe you number .98 meters to be bit high, but I don't know and can't prove it.

**Humminbird_Greg** · 03-08-2011, 08:22 AM

The .98 meters was just a number I pulled out of the air CP; it was not based on anyting but was used to show that I was looking for a distance to quote and not that it mattered on this, and this, and this...

**Cane Pole** · 03-08-2011, 10:41 AM

I understand. I just pulled .01 meters out of the air. Must be because I am in Tennessee. ha

**DonDon** · 03-08-2011, 11:02 AM

ON survey grade GPS equip, they're talking 3 centermeters of accuracy. Meaning that if I survey a point, I'll be within 3 centermeters of exactly where it's at. They're also being more work on the Ellipsoid of the Earth to adjust things out even better. Before to get that accurate, I'd have to set my GPS up and let it run for about 20-30 minutes, now I can do that in just a couple minutes

**Cane Pole** · 03-08-2011, 11:06 AM

I thought the survey grade used 2 frequencies??

**mduncan62** · 03-08-2011, 11:10 AM

Doesn't the survey grade also use the ground stations for accuracy?

**Crappie Reaper** · 03-08-2011, 11:12 AM

Originally Posted by mduncan62

Doesn't the survey grade also use the ground stations for accuracy?

I believe your unit is the ground station.

**mduncan62** · 03-08-2011, 11:16 AM

Originally Posted by Crappie Reaper

I believe your unit is the ground station.

LOL. Talking about these below.

Ground Stations
The GPS control segment consists of several ground stations located around the world.
A master control station at Schriever Air Force Base in Colorado
Six unstaffed monitoring stations: Hawaii and Kwajalein in the Pacific Ocean; Diego Garcia in the Indian Ocean; Ascension Island in the Atlantic Ocean; Cape Canaveral, Florida and Colorado Springs, Colorado
Four large ground-antenna stations that send commands and data up to the satellites and collect telemetry back from them

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