If the map file actually isn't on the card anymore, then ask yourself:
Did you make a data card backup to your computer like the user manual suggests?
If yes, put the backup file onto a 2GB SD card and stick it back into your Iway.
If no, then you're out about $90 to buy a new set of maps. They come from Navtec, you can't buy them from Lowrance because Lowrance doesn't produce them.
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This is the info from the Lowrance website
Begin with the iWAY 250C turned off, not just on stand-by. Stand-by is the default setting for the unit when powering down. Change the settings in the interface menu to power off instead of defaulting to stand-by when the power button is pressed. Connect the iWAY 250C to an available PC port. With the PC turned on and operating, turn the iWAY 250C on. The PC should make a sound recognizing a USB connection. If there is no audible sound, try another USB port on your PC. If there is a tone of recognition and the iWAY 250C is not displayed as a separate drive in My Computer, there may be a drive conflict. Change the drive letter of the iWAY 250C. Click here if you have a drive conflict with Windows 95, 98, or ME.
I have had a similar problem and founf this site where you can get a new card that will work for your GPS. Info, pasted below:
The Nextar GPS-MAP09SDC SD card with updated navigational maps and information has a MSRP of $69.99. Please visitwww.nextar.com to purchase the map upgrades and for more information on upgrading your maps.
You need to buy the Navteq map update, but you can call them and send in your memory card they will update it for a reduced cost, since 75 plus 12 shipping is too much just for maps, you can buy a whole new one.