Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

Will GPS elevation work?

 
LinkBack Thread Tools Display Modes
  #1  
Old 09-05-2007, 10:41 PM
rdc rdc is offline
Junior Member
 
Join Date: Jan 2006
Posts: 29
Will GPS elevation work?

I'm tired of searching, read the pinnned altitude vs barometric above and I have no way to test ambient pressure vs altitude corrected from barometric sea level(STP metrics)

Can I get by using altitude correction up to 600 yards or will I miss? 2-4" of error will cause a miss. That $32 La Cross wind meter/temp is calling me. And did I mention I'm cheap.
Reply With Quote
  #2  
Old 09-06-2007, 05:54 AM
Platinum Member
 
Join Date: Jun 2001
Location: Potomac River
Posts: 5,059
Depending upon your bullet and cartridge, a thousand foot elevation change will cause about a half inch of difference at 600 yards.

The way to prove this to yourself is to run your ballistics program once with one set of data and then change the altitude by 1000 feet while leaving all other factors the same.
__________________
The Smokin Fur Rifle Club
Reply With Quote
  #3  
Old 09-06-2007, 09:39 PM
rdc rdc is offline
Junior Member
 
Join Date: Jan 2006
Posts: 29
Okay. Found out my software will not correct for elevation.

With reference to altitude vs. ambient pressure. Can I get by with a GPS instead of purchasing a Ketrel 2500 at my personal max of 600 yds?
Reply With Quote
  #4  
Old 09-06-2007, 11:32 PM
Platinum Member
 
Join Date: Aug 2005
Location: Back in the south -NW FL..
Posts: 1,142
I'd say -yes -gps elevation is supposedly accurate.

I stood at a bronze plaque put there by USGS and my gps was a couple of feet off according to the elevation.
__________________
AIPAC for president !!!!!!!!!!!!!!!!!!!
Reply With Quote
  #5  
Old 09-07-2007, 08:01 AM
Silver Member
 
Join Date: Aug 2003
Location: McKinney TX
Posts: 403
Quote:
Originally Posted by rdc View Post
I'm tired of searching, read the pinnned altitude vs barometric above and I have no way to test ambient pressure vs altitude corrected from barometric sea level(STP metrics)

Can I get by using altitude correction up to 600 yards or will I miss? 2-4" of error will cause a miss. That $32 La Cross wind meter/temp is calling me. And did I mention I'm cheap.
RDC,

Altitude is not the best means of measurements but out to 600 yards the margin of errors is very small. Barometric pressure is the best means, but it's not always that simple... well it's pretty simple?

I have a Krestel 4000 weather meter that I use and each time I head out to the range I have to check my local area conditions and calibrate the unit for the current and known barometric pressure. With the internet this is a quick and simple process and it takes less than a minute to calibrate my Krestel.

Best of luck.
__________________
Jeff

Mathew 5:16

Distance is not an issue, but the wind will make it interesting!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Will GPS elevation work?
Thread Thread Starter Forum Replies Last Post
Ran out of elevation on Zeiss................why? continentaldrifter Long Range Scopes and Other Optics 2 02-10-2009 12:27 PM
Ran out of elevation JAWZ Long Range Scopes and Other Optics 7 05-17-2008 06:17 PM
enough elevation? buckdeer Long Range Scopes and Other Optics 4 11-27-2005 08:39 PM
Out of elevation Kenster-Boy Long Range Scopes and Other Optics 18 06-05-2005 11:38 PM
Elevation, Is that all there is? Weedwacker Long Range Scopes and Other Optics 8 05-21-2004 02:51 PM


All times are GMT -5. The time now is 02:50 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC