I have a Nokia 500 gps system. The sd card with

If your TomTom shows a red cross, it means the device is not able to load the software to be able to operate. Some devices have this software on a SD-card, some have it stored on an internal memory.
If there was a SD-card in your TomTom, I would suggest to put it back. If there is a empty SD-slot on your device, it could be you lost your SD-card, but some TomTom devices have an internal memory AND a SD-slot for memory extension, so if you have an empty cardslot it doesn't necessarily mean there has to be a card in it.

When you never saw a SD-card, probably some data went corrupt on the internal memory. When you have a SD-card, probably some data got corrupted on the SD-card.

To repair the software, you need to connect your GPS to your PC or Mac with a USB cable.
You also need the program TomTom HOME. You can download it for free on the TomTom website.
With TomTom HOME you can update the operating system of your device for free (map updates are nor free).

Try updating, and see if your device works again.

If this doesn't work, post it here.

an updated owners manual maybe needed

http://www.retrevo.com/support/Magellan-3045-GPS-manual/id/23694ci354/t/2/

You have a few corrupted files internally. Contact Rand Support to
obtain a new update SD Card to upgrade you to the new version and maps. The update SD Card will not remove your user
data. Be sure to have your serial number handy,
(back side, bottom right).

You have a few corrupted files internally. This is a message that might be misleading. Contact Rand Support to
obtain a new update SD Card to upgrade you to the new version and maps. The update SD Card will not remove your user
data. Be sure to have your serial number handy,
(back side, bottom right).

Thanks,

Mark,

Rand Lead Beta Tester

You have a few corrupted files internally. This is a message that might be misleading. Contact Rand Support to obtain a new update SD Card to upgrade you to the new version and maps. The update SD Card will not remove your user data. Be sure to have your serial number handy, (back side, bottom right).
Thanks, Mark
Rand Lead Beta Tester

Sounds like the data on your SD card is corrupt. If you know somebody else with the same unit and model try their SD card. If not them you are most like going to have to buy a new SD card and install the maps and operating system onto the new card. Should be instructions on you install Cd assuming you have them.

If it says it can't find map data then your SD card is corrupted.

It's a fatal flaw in the WindowCE 5.0 operating system that was used for Nextar GPS builds. Basically, if you have a power glitch while it's reading your SD card (contains the maps) then your SD card get's corrupted.

Don't expect any help from Nextar. You will have to get the original data from another person's SD card with the exact same model

I woulod think the data is corrupted or not in ther format the GPS is expecting. redownload the data to the PC desktop and see how it is organised

i have come to the conclusion the mgb card itself is corrupted
i put in my nokia 5800 and it says card corrupted
i format card all looks ok
remove from nokia
and put back in again
and card corrupted again,
also 8gb card from my nokia (not the same one)
works in the pixion ok
so im sending back the card