Grasscatcher Posted March 23, 2013 Share Posted March 23, 2013 In Mesa Co Colorado, one of the BM in Colo National Monument is a BM with ID KMO 444 - FRUITA. Just as a project, I took on finding all six USGS BM within the Natl Monument. Some didn't have any record of being found since they were monumented in 1934, so I thought it would be fun. Some were easy, easy and others were long hikes and steep climbs, but that's what I love to do so...... In the process of finding all six, I just uploaded the coordinates for the station itself from the original data sheets into my GPS. I didn't bother uploading the ref mark coordinates or even necessarily look for the marks, but did stumble across several in the process of finding the stations. The BM all have adjusted coordinates and were found in good shape. After finding all six over a period of time, it dawned on me that I should have found all the Ref Marks while I was at it....DUH ! Oh well, it was all about being "out", and the hikes, and the challenge, so I noted all of the ref marks that I hadn't already stumbled across, and plotted them from their distances and bearings and datum taken from the orig data sheets. Yesterday, after a couple of previous trips failed to find any of the missing ref marks at a couple of the stations,the weather was perfect and I was DETERMINED. For this FRUITA station I found both Ref marks and my coordinates agree with the Ref mark coordinates posted by a previous finder and published on the Groundspeak Data sheet......but compare those coordinates with the orig data sheet "location" established by dist and bearing. BIG difference! If I had used the previous finders coordinates, I would have walked right straight to both!.... but instead I used "official" data I thought would eliminate any possible error. I can't find any combination of bearing error, magnetic vs true error,Datum error, N vs S or E vs W error, or anything else that makes sense. Can someone else plot the Ref mark locations (for KMO444) from the orig data sheet and compare with the Prev Finders locations on the GS data sheet (also below)? I'm stumped........Did I screw up or are the orig data sheet location descriptions wrong? Below are my “as calculated” and the actuals (as found) Fruita Ref 1 39 05.23556 -108 43.95456 3/22/2013 Fruita Ref 1 Act 39 05.22600 -108 43.97304 6464.101 3/22/2013 Fruita Ref 2 39 05.23396 -108 43.96527 3/22/2013 Fruita Ref 2 Act 39 05.21820 -108 43.95546 6448.599 3/22/2013 ….and the previous finders locs… RM1 N 39° 05.227' W 108° 43.975' RM2 N 39° 05.220' W 108° 43.956' Quote Link to comment
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