I was using the unit with no problems this morning and the batteries were running low, so I put in fresh batteries. When I turned the unit back on it wouldn't acquire satellites. I left it for a few hours and tried again - no satellites. I put in the old batteries and it still won't acquire satellites.
after days still not acquireing satellites
Update/Reload your unit's GPS and sytem software via Garmin page or use Web Updater. Your unit will be functioning again. This problem also occurs if you leave your unit on a dash board in a car and it is exposed to hight temperature.
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This is taken from the Nextar Support Web Site;
" Q: NOTICE for all US customers with M3 and Q4 series that have been having a problem recently with receiving a satellite signal.
A: Recently it has come to our attention that there has been a problem with a US GPS satellite, in the early morning of June 14 launch a sudden change in the code signal, leading to some GPS signal anomalies. It is told that the satellite signal should be running properly by June 22, 2009.
Accordingto Garmin, this problem can be fixed by disabling the WAAS feature in teh set up menu. There is an incompatibility between the old Garmin software and latest WAAS upgrades. Later software from Garmin is supposed to fix this problem.
I have run into the same problem and it may be related to the WAAS (Wide Area Augmentation System) feature. Try disabling this feature (under MAIN MENU / Setup). I used this receiver overseas (Asia and Europe) last year for 35 days straight with no problems. During this time WAAS was disabled as none of these satellites are visible overseas. The problem occurred intermittently prior to the overseas trip, and has reoccurred after returning. I was running into the same problem this past weekend and noticed the screen blanking out (with the vertical line) shortly after differential corrections were applied to the GPS signals. I disabled the WAAS and let the receiver run for over an hour. The problem did not return. Hope this helps.
You need to connect TomTom to a computer and run their 'TomTom Home' program. Let it check for updates. It will download a file called "QuickGPSfix data". This file updates your TomTom with the latest satellite positions and ensures your TomTom will find its coordinates very quickly after switching on. A new file can be downloaded at least once a week. Generally, the longer you left it since downloading this file, the longer it will take to find its coordinates (ie. find a signal).