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It might mean that the signal is disrupted. Might be a software glitch. Try going outside, get a clear view of the sky. Then reboot/reset the unit. Hold the switch to the reset position or off position for 10 seconds, it will shut off. then switch it back on. It should reacquire a signal within 2-5 minutes, then it will fix on your position. If that doesn't work, try updating your software. Call Magellan Tech Support for instructions.
You can download the US basemap for the 500 at http://www.megaupload.com/it/?d=EJTNQH03 Rename it BASEMAP.MGI Then copy it in the directory "background maps" in the SD card of your 500, by using a SD card reader/writer. Insert
the SD card in your 500 and connect it to your PC; then turn it on;it
will turn on regularly, because the basemap in the card will be
detected; turn it to USB file transfer mode, and copy the basemap from
the SD card to the directory "background maps" of the 500. If you already have the file ..just rename it like I said ..and copy it ..using the sd card in the reader...Than if it is not functional ..just reset it ..and reload the file the proper way by reloading maps..
One temporary solution is to remove the battery for a while until all the capacitors in the unit discharge. Upon replacing the battery, you get one good power up try. Notice that the date and time have reset. Once you turn off the unit and try to power it up again, the problem comes back and you must again remove the battery for a while. There may be a patch to fix the boot loader, but I have not found it yet.
Jeff, I had the same problem with my explorist 500. Your unit lost the "BASEMAP.MGI " file. You will need to get a copy of that file. Then install it.
Try this site http://imhz.com/2006/05/my-explorist-is-screwed.html
(I would recomend all explorist GPS owners copy and save that file and store it in a safe place. I have mine on a thumb drive).
eXplorist units have also some hidden and service functions. Like, if unit is off, you can to press:
- IN + PWR - to full selftest of unit (screen test, keypad test, NMEA test)
- OUT + PWR - to serial port test
- ESC + PWR - to burn-in process
- LIGHT + ENTER + RWR - tp uploading of new firmware
- NAV + PWR - to call Service Function window (see below)
- NAV + MENU + PWR - to force power off, equal remove batteries.
- GOTO + OUT + POWER - clear memory and set all settings as default.
if you don't mind taking it apart, carefully unscrew the case and seperate the two halfs (be carefull not to break any of the wires or ribbon connections) , pull off the rubber pad with the buttons, and clean the contacts on the circuit board (you could use alcohol, or I use model railroad track cleaner that you can get at a hobby shop)
Try turning off the WAAS function to see if that makes a difference. If it's already off, try turning it on. It's either a software/memory problem, or there's a short in the antenna. There is no update available for that unit.