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Try updating the unit`s software. This can be obtained for free from Garmin.com. A new satellite launched was causing reception problems and the update fixed it. This might be the problem with your unit. Come back and let us know if this fixed it.
Try updating the unit's internal software and drivers. A new satellite was launched which caused problems and the updates solve this. Let us know if this solution solves your problem, and please rate our answer. Thanks.
Try updating the unit software. A new satellite was launched this year and has been causing problems. The updates from Garmin fix it. Disable the WAAS in the meantime and see if that solves the problem in the meantime.
I had the same problem with the eTrex Legend (monochrome) and tried the solution of taking it apart, cleaning the connections and putting it back together. This did not work for me. I then updated the firmware to version 3.9 and that solved the vertical line problem, at least for the time being.
I had this problem today, updated the software, now the unit seems to be working perfectly. The unit "crashes" (single line down screen center) as soon as it get enough satelites to work with WAAS.
Go to Garmin site for software updates. Download and install the WebUpdater. Once or unit is hooked up to your computer and you have internet access, the software will download and update your GPS with the latest software fixes. I had software Version 3.7. For the Legend, Version 3.9 fixes the problems with WAAS.
Do the following:1 - Make sure you have fresh batteries in the unit and turn the unit on.2 - Check the GPS date and Time. On the Main Menu at the bottom of the screen, you can see a date and time. If the date and time are not current, then the clock is your problem. You will have to wait for the almanac information to be updated. Details are below in a later section.3 - Make sure your GPS is in the Normal Mode and not a demo mode. Verify other systems settings.
Go to the main menu and click on Setup icon.
From the Setup screen, access the System screen icon.Verify the following settings: GPS: normalWAAS: EnabledLanguage: English or your choice.Battery: Set according to your battery types.4 - Check your GPSs Version Software.
Go to the main menu and click on Setup icon.
From the Setup screen, access the System screen icon.
From the System screen, access the sub-menu icon in the upper right bar.
Select "Software Version" from the list. Verify the actual software version for me.The latest version available for the eTrex Legend is version 3.90 dated March 2008.http://www8.garmin.com/support/download_details.jsp?id=711Update the unit using this latest software and using Garmin's Webupdater.http://www8.garmin.com/products/webupdater/howtoinstall.jspIf that won't work, use the following download page to access the latest software updates per units.http://www8.garmin.com/support/blosp.jsp5 - Resetting your GPS clock and almanac informationNext you may need to acclimate your unit to a new date and time (almanac information). If you had your unit off and without batteries for over a month since you last accessed satellites, then your clock and almanac information may be incorrect. Even Garmin acknowledges this problem after software updates and the problem with accessing satellites. They state: "unit data including alamanac information may be incorrect or cleared. Back up all user data before upgrading. After installation is complete, place unit with a clear view of the sky for 15-30 minutes to re-acquire almanac data. "I know of no way to reset the clock using the GPS menus. All I can suggest is that you do the following:A - turn the unit on and wait 5 minutes or so for the "Poor Satellite Reception" screen to appear. See page 7 of the owner's manual.B - Set the "new location" to your area using the map when the "poor satellite reception screen" appears. Be sure to use the "map" option and not the "automatic". C - Set the GPS outside with a clear view of the sky. Check on it every 10 minutes. When the "Poor Satellite Reception" screen appears again, then click on "Restart Search". The "Restart Search" option is used when the date provided in the GPS is not today's date. (See page 7 of the Owner's manual for an example)Legend Owners Manual: http://www8.garmin.com/manuals/eTrexLegend_OwnersManual.pdfD - Once the GPS can track 4 satellites, then the clock should reset and you should be fine. This process could take up to an hour. I have had this problem with my eTrex Vista and eTrex Legend (both backup GPSs) and resolved it by having the clock reset. In fact, I just tried my eTrex Legend today after not using it for many months and storing it without batteries and it had this same problem. I followed the steps above to fix the problem. This took about 35 minutes.