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Re: differential GPS-use UTM
By:Tim Smith
Date: 5/4/2000, 1:08 pm
In Response To: Re: differential GPS-use UTM (Doug)

Doug,

I think you are one place off. If I remember correctly UTM (Universal Transverse Mercator) and MGRS (Military Grid Reference System) are very similar. MGRS divides the globe into 10km grids. People refer to 6,8, and 10 digit MGRS which define 100m, 10m, and 1m squares respectively. In other words, 10 digits gives you 5 each for 'northing' and 'easting'. I think 0,0 would be the south west corner of a grid. This one I forget sometimes. Anyway, my GPS (Garmin 12) provides MGRS in 10 digits as an option. When I was testing the other night my estimated position error (EPE) was displayed as 17'. I switched to MGRS and the last position varied by no more than 4 (4 meters) for several minutes. This agrees fairly well with a 17' EPE.

Tim

Messages In This Thread

GPS users
Kent LeBoutillier -- 5/3/2000, 6:15 am
Re: GPS users
Totto -- 5/3/2000, 3:42 pm
Re: GPS users
Charles Cooper -- 5/3/2000, 4:11 pm
differential GPS
Bruce -- 5/3/2000, 7:55 pm
Re: differential GPS
Dale Frolander -- 5/4/2000, 12:04 am
Re: differential GPS
Dale Frolander -- 5/4/2000, 9:39 pm
Re: differential GPS
Mitch Isoe -- 5/12/2000, 1:49 pm
Re: differential GPS
mike -- 5/4/2000, 1:25 pm
One millimeter?
Bruce -- 5/4/2000, 9:33 am
Re: One millimeter?
Tig and Tink -- 5/7/2000, 7:59 pm
Re: One millimeter?
Paul G. Jacobson -- 5/4/2000, 4:51 pm
Re: One millimeter?
Shawn B -- 5/4/2000, 11:05 am
Re: differential GPS
Kent LeBoutillier -- 5/4/2000, 5:59 am
Re: differential GPS
Paul G. Jacobson -- 5/3/2000, 10:09 pm
Re: differential GPS-use UTM
Doug -- 5/4/2000, 12:03 pm
Re: differential GPS-use UTM
Tim Smith -- 5/4/2000, 1:08 pm
Re: differential GPS-use UTM
Doug -- 5/4/2000, 3:09 pm
Re: Good info on GPS
Mitch Isoe -- 5/4/2000, 3:42 pm
OOPS!
Tim Smith -- 5/4/2000, 1:51 pm
Re: differential GPS
Pete Roszyk -- 5/4/2000, 9:26 am
Re: GPS users
Totto -- 5/3/2000, 4:34 pm
Re: GPS users
Hank -- 5/3/2000, 12:25 pm
Re: GPS users
Bill, near Maryland -- 5/3/2000, 4:10 pm
Re: GPS users
Tim Smith -- 5/3/2000, 10:12 am