Geoid12a vs Geoid12B explained by NGS here. It says there is some differences from Geoid12 in the southern US, but 12a and 12b are identical except in...

Anybody know of a good English survey idiom to Yankee translator? I think I get the gist of the problem, but don't know the specifics of how they "bon...

Welcome.?ÿ I remember a long discussion over a mine survey you were working on.?ÿ Couldn't get it to close underground, but the same equipment gave ne...

GPS week 2048 (a power of 2) is begins April 7, so if the receiver has a limited number of bits for the week this could be the magic end date for RTK....

What will cause it to be non-operational?

OPUS assumes ARP and makes you manually enter its height above the mark (not slant).?ÿ There are drawings on the NGS site (when it is available) showi...

Google Earth registration to actual coordinates is variable, but has gotten much better for my area in the last few years.?ÿ They seem to be on WGS84/...

?ÿ You are 4 mm = 0.013 ft at 318 degrees from my constant bearing midpoint.?ÿ Validation for both of us.

I reworked the spreadsheet for the constant bearing line and now it comes out at almost exactly the mean latitude, and 3 mm east of the mean longitude...

It is a shame that something that still appears to have all the original capabilities is of such little value now.?ÿ The Sokkisha would even be a step...