Big Bend Conservancy
Quote from: RichardM on April 13, 2018, 10:23:01 PMGot coordinates for the Jenga cairn? I'd like to guess how much we came up short...I recorded a waypoint on my GPS:UTM 13R 0701779 E 3234584 N NAD27LAT 29.225555 LON -102.92410266521527 NAD27The Lat-Lon is calculated using an online utility. The waypoint was recorded using UTM.
Got coordinates for the Jenga cairn? I'd like to guess how much we came up short...
Unfortunately a lot of the older topo data is NAD 27 data. - North American Datum of 1927. It is the datum used for most USGS topographic maps printed before 2009. NAD83 is used on maps printed after 2009, If you are using GPS along with a topographic map, you should make sure that the GPS datum matches the datum used on the map. The default datum for most GPS units is the World Geodetic System of 1984 (WGS84), which is virtually identical to NAD83.
Now, we just need to restart the whole UTM vs. Lat-Lon fight.
Great info and possibly why on my last trip I was scratching my head when the coordinates for some springs did not line up with my location and maps, I probably had my Caltopo maps set for WGS1984 instead of NAD27.
This post was probably a waste of your time...
...but I'm trying to get to 4000!
Recommendations:1. Ignore everything I said above and keep doing what you've been doing.....
This post was probably a waste of your time, ....
My GPS unit crapped out after 15 years. Gonna have to replace. Any suggestions on one that is relatively inexpensive, yet effective?sent from my Note 8 using the Big Bend Chat mobile app
My GPS unit crapped out after 15 years. Gonna have to replace. Any suggestions on one that is relatively inexpensive, yet effective?
I got a Garmin 64s last year for what will be my last dedicated GPS unit. Replaced an ancient eTrex. it's OK, but the UI is still somewhat counterintuitive to me. It's a redundant device for me, as I'm usually already carrying a phone and Spot tracker device. (And for anything more than a half day hike, or longer but on a well defined trail, a map + compass).Serious question because I do not know: is "datums" a correct plural? Like "stadiums"?
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