[Cdt-l] etrax 30 Question

Larry Swearingen larry.swearingen at frontier.com
Wed Jan 22 14:46:36 CST 2014

I have been doing that.  When I do that I need to setup the gps for whatever coordinate
system the map uses so I’ve been practicing for that using my BLM maps and also the 
Bear Creek maps.  I’ve been looking up the Coordinates to a known Bear Creek WayPoint
after changing the Coordinate System to that used on the BLM Maps and locating that point
on the BLM Map.  BLM map coordinate system is not the same as those used on BC Maps.
However the gps will convert the way point coordinates to whatever you set it up for.

I agree though.  The middle of the Gila Wilderness is not the place to try and figure this out
for the first time.  :>)  I do hope to not get so far lost that I’m off a BLM Map.  That would be Lost !


From: Tjamrog08 
Sent: Wednesday, January 22, 2014 1:07 PM
To: Larry Swearingen 
Cc: Frank Gilliland ; cdt-l at backcountry.net 
Subject: Re: [Cdt-l] etrax 30 Question

You got it, HooDad.   
Not covered in GPS manuals is being sure to align the settings on your GPS with whatever physical maps coordinate format it has along the margins. You often need to do a little decimal estimation, as the points along the margins are marked in only three or four places.   
I was using  Jerry Brown's maps, and it took a bit of for me to be able to (1) establish a GPS reading where I as at and then (2) relate that to the physical map.  I'd practice this before I went.  
It saved my ass twice when I was so far off the CDT that I was off of the narrow corridor on the map.  What you do is hit Your exact "lost"  location on the GPS, then orient the map magnetically, and then see just how far off and in what direction you'd have to travel ( usually bushwhack) back to get to the CDT.  
You must know how to do this, and you might not be calm enough to figure it out the process  if you start to panic wandering around out there.
Yes, practice.  
I would also practice at home navigating to a single waypoint.  

Uncle Tom 

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