Is Your GPS Receiver Set-up Correctly?

Setting up the GPS receiver is key to accurate navigation.  The phrase "match the map" is a big first step. 

Therefore, ensure that the GPS receiver's default settings correspond with key factors on the map.

  

A selection of such factors includes:

• Set the compass page to working in degrees true rather than magnetic.
• Position format/cordinate Systems (e.g., UTM Grid or Latitude and Longitude.)
• Use the correct map datum.

 Note that every time the GPS receiver’s batteries are replaced, the electronic compass needs to be calibrated.  It’s a simple process that requires a quick check of the owner’s manual.

Both the compass and GPS receiver must be set to complement each other.  For example, if the hiker has a basic base plate compass (one that cannot be adjusted for declination) then the GPS receiver’s “north reference” must be set to magnetic.  If the hiker has a compass adjusted for declination then the receiver should be set to true north.  If compass and GPS receiver don’t match then the bearing information may be as much as 10° to 20° off.  That is not good.

I carry a Sylva Ranger style compass that can be adjusted for declination.  Before leaving home I visit www.magnetic-declination.com to verify the correct declination for my planned hunt location.  With that information I adjust the compass.  Yes, the magnetic needle still points to magnetic north but the rotating dial provides degree/azimuth information in degrees true.  

Now my GPS and compass settings match my topographic map. 

GPS Electronic Compass

A tip to keep your GPS performing to the design specs.

If you have a new GPS check the owners manual to see if you have an electronic compass.

Some models have a compass page but don't have a true electronic compass.  Models such as the Etrek (basic), Venture, Magellan Sportrack have a compass page but the direction information presented is based on movement and satellite data received.

Models such at the DeLorme PN60, Garmin 60CS/CSx, Vista, Garmin62 have electronic compasses.



Compass Page

If the compass data presented when you are returning to a destination looks questionable you might need to calibrate the compass.  For example, if you can see the destination (e.g., a red tent) and the compass is 20 degrees "off." I would then check the calibration.

If I have changed the batteries in my GPS compass calibration is required.


Here is how it's done with a Garmin GPS receiver.

Press the page button to get to the compass page.




Then press the menu button one time.

The page menu will give you several options and in this case select calibrate compass.

You will then receive an on screen prompt to calibrate the compass.  Now you just follow the directions.