@rfc Unadjusted measurements from 3102-2 averaged 239.3965'. 2-3102: 239.4475. The GPS inverse is 239.02' and your original adjusted traverse distan...

Pretty cool calculator. I have no plans to do a sun shot but it is nice to know about some of the resources.

3 weeks a go, Oct 24, there was a post named "Shoot The Sun". There was an Ephemeris page as some other stuff you might like.

@mightymoe DOT multiplied grid coordinates by the scale factor, so we continued with that system.   That is not correct in my area becau...

I dug out my old Nomad 800. It has Survey Pro 5.2 and under Survey it has Solar Observation. I have never used that one but I looked at the settings a...

Are you asking about the HP48 with the TDS Survey Card? It has a Sun Shot routine that I used a few times 20 years ago. It was easy to use and the res...

Good point. Might be a simple solution to the discrepancy.  

Yes another couple measurements is a great idea and will most likely clear up this discrepancy.  

This is not a Parcel Map that you are looking at. This is an Assessor parcel map used as a reference map showing possibly all the survey grade Parcel ...

Almost correct. Leave out 5:2. That is the surveyor's point 1:2 that I adjusted 0.28'. After translating your 5 points based on moving 500 to 100, you...

Isn't that the truth and thanks for the explanation. Your math skills are way beyond mine but I too find it fun to work out a math problem. It's proba...

Okay while I was writing you posted a map that I ignored earlier. That is an assessor map showing all the available survey maps in your Contra Costa C...

Like @williwaw said " you would need to do an actual survey to establish the true nature of their relationship by tying down both the county monuments...

Years ago 1980's we had to establish astronomic north (using a Polaris shot) for a BofB to layout 5 big radio towers. According to the site engineer, ...

1.) Enter the grid coords for points BR-4,5,6 into a traverse program and inverse between the points for the bearings and distances. 2.) Check the i...

@rfc I am however, really perplexed at how state of the art Leica RTK equipment can produce a point that's .28' off in fairly benign conditions. &nb...

Nice excel file and I could follow everything except those constants a1,b1,a2,b2. How did you get those? And no worries about your previous reply. I...

Yes I think the old surveyors point 1:2 is off by 0.28'. I am assuming that because the new point 5:2 will inverse to the surveyors old 4:1 and get th...

No RR expert here either but my software put the data you posted together and it looks good. The first station 445+18.4 appears to be NFG if we hold t...

So remember that 0.3' possible error in that 239 foot line? I calc'd a new #1:2 point 0.28' on the same NW bearing from #2:2 = #5:2. Then I inversed a...