Most accurate GPS ?

steeltraps

Well-Known Member
Joined
Dec 13, 2013
Messages
247
Location
alabama
Ok If someone was burying something in the ground. Lets say treasure. And need to mark that spot down to the inch. What would be the best GPS system for that ? Needs to be accurate
 

jebel

Well-Known Member
Joined
Jun 15, 2018
Messages
307
Location
Oregon
I don’t know if anything will guarantee you down to the inch, but you’ll get best accuracy from a dual-frequency receiver. Here’s some good basic information on GPS precision.
 

Axl

Well-Known Member
Joined
Apr 15, 2015
Messages
555
Location
SW Montana
After you bury it send me the coordinates and i will test my Garmin on it. If you find an empty hole then buy a Garmin Dakota!
 

HVYDOC

New Member
Joined
Dec 13, 2014
Messages
4
A Trimble survey unit w/radio transmitter in a set location will do better than an inch but will set you back around $60-75K. The government puts in a random changing error into civilian units,
 
Joined
Dec 10, 2012
Messages
7
As I understand it the government imposed random (SA = selective availability) was turned off in 2000. Now the errors come in from atmospheric effects on signal travel time, number of satellites, signal loss due to obstructions, etc.
I Geocache in heavy terrain so the accuracy of my Garmin gets tested a lot. Using GPS, GLONAAS, and WAAS my typical repeatable accuracy is 8 ft in fairly thick cover, 16 ft in horrible cover, and 3 to 4 ft in open area assuming I let the GPS waypoint average for at least 5 minutes regardless of “%complete” it states.
‘Survey units running RTK (like Trimble) where base unit waypoint averages all day and sends the mobile unit time correction signals easily get down to less than an inch.
‘For reference when working with a surveyor friend of mine running a RTK setup we have found Google Earth maps to be 20 ft or more off when referencing to an obvious physical point (tree, fence post, etc). For that reason I never use Google Earth as my final method of determining coordinates if the measurement is critical.
 

dfanonymous

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Joined
Jul 16, 2016
Messages
1,279
Best you can do is within a meter. 10 digit grids be like that sometimes.
 

Tripodmvr7

Well-Known Member
Joined
Sep 17, 2020
Messages
111
Location
South Africa
I am a land surveyor and did a test between my survey GPS and a Garmin Etrex 20. Difference of 3m was found. The Etrex was not left measuring for long and there were no obstructions close by. To navigate back to a fixed point with 3m accuracy is foolproof. Take into consideration that the Etrex resolution is 1m.
 
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