Question about Garmin eTrex Legend Cx GPS Receiver
Ever since moving my GPS unit form Idaho to California the coordinates seem to bee off by 20-50 feet. I have turned on and off the WAAS and it has made no difference. I had this problem two times in Idaho but have it all the time now. In Idaho it seemed to be fixed by shutting off the WAAS. I have reset and reloaded and updated all software. Any suggestions would be usefull.
How are you determining your error? If you are comparing your position to a map and you are getting error consistently, it could be that your map datum does not match the datum set in the GPS. Without WAAS turned on, your error should be @15'. With WAAS on it should be @ 6 to 9'. If you are using the Sattelite screen to determine your error, remember that is just estimated error. Higher estimated errors can be caused by satellites that are blocked or not visible to the GPS, or poor satellite geometry. It is normal for example, to have more error in high northern or southern latitudes due to less satellites being visible. With good reception you should be able to see 8 to 12 satellites on your satellite page. Signal strength is also important, You can have a lot of visible satellites but if the signal is weak your error wil increase. The signal can be weakened by heavy tree cover or high objects such as buildings or mountains. Such interference is called signal path error. Another form of signal path error is when the signal gets reflected off something before it gets to your GPS. For example; you're in a canyon and satellite 1 is to the east of you. The eastern rim of the canyon blocks the signal from satellite 1, however the signal bounces off the western rim and your GPS then picks it up. Because it took longer to get to your GPS, the GPS thinks that the satellite is farther away than it really is, causing a postion error. (This would not show up on your estimated position error shown on the satellite page because the GPS does not know this is happening.)
When WAAS is turned on it takes a channel that would normally be dedicated to a GPS satellite. It's possible that turning off WAAS helped you because having an extra GPS satellite improved your geometry which improved your accuracy more than the corrections WAAS is designed to make. The next time your error seems high, check how many satellites are being tracked and how strong the signal is.
Posted on Feb 15, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Aug 06, 2014 | Cell Phones
May 09, 2013 | Tomtom GO 750 LIVE GPS Receiver
Sep 22, 2011 | Garmin nuvi 215 GPS Receiver
May 10, 2010 | Garmin nuvi 255W GPS Receiver
Jan 01, 2010 | Magellan Maestro 4350 GPS Receiver
Aug 07, 2009 | Garmin eTrex Legend Cx GPS Receiver
Aug 18, 2008 | Garmin Nuvi 660 GPS Receiver
Apr 13, 2008 | GPS
Apr 01, 2008 | Garmin eTrex Legend GPS Receiver
Feb 10, 2008 | Garmin eTrex Legend GPS Receiver
147 people viewed this question
Usually answered in minutes!