No matter how good the reference mark azimuths are, they are usually under 100 ft from the station, so not good to project 2000 ft.

I know it's just art, but that wire sculpture makes my back hurt and my head wonder what results he will get while holding on to the tripod with both ...

I think any point with NGS NAD83 coordinates was at a minimum recalculated in the monster least squares fit of their raw observation data. NGS doesn't...

Every time that is mentioned, my mind goes back to the "sinister force" that erased Nixon's tape. Translation: "pushed the button with my left hand."

I would be highly suspicious of any conversion from NAD27 to NAD83 if you are looking for tight agreement with other data.?ÿ But if the DOT is designi...

I have a Leitz half-minute transit that had gotten knocked over before I bought it (seemed cheap at the time).?ÿ The upright pieces were obviously ben...

And not looking to be the best cared for.?ÿ I'll be surprised if it sells for that price.

Right. A 30" instrument is illustrated in three textbooks with degrees divided in 3 parts, and zminutes 20-0-20 in 2 parts to read 30". But there are ...

I vote with Dave.?ÿ?ÿ It's been a while but I have read a vernier (yup, geezer).?ÿ Reading the outer scale at the arrow tells you which 15 minute segm...

Why would anyone prefer bearings unless they were reading off a compass or brass transit marked that way? I find azimuths much less prone to blunder.

Strange.?ÿ Must be a condo arrangement where the HOA owns the area outside the circles.

UTM would have originally tied to NAD27 in North America and some other datums elsewhere in the world. Back then there were fewer choices of datum. Th...

UTM is like SPC or LDP in that all of those are map projections. You have to have an underlying datum to tie down what it is you are projecting. NAD27...

I have no inside information about that program, but having written my own pale imitation of it (2-D plane only), I have a pretty good idea what it mu...