Instead of zip code you can enter a city to set the location coordinates, but for some reason that feature isn't available in x36 and SDS scanners, AFAIK, but it is available in a HP1 scanner but still have that old firmware code lingering in all those new scanners that checks that the city table are still readable and intact.
Format the SD card, it's probably ok after a reformat, and download the database again that also include a 10 year old city table, and select clear user data in Sentinel and program the scanner.
/Ubbe