The original FBL may not have had routing data. Only some FBL maps contain routable road networks. Use QMapShack 's Map Information tool to check attributes. If missing, you cannot generate routing via simple conversion.
If you need a map for a different GPS application, it is faster to download that same region in an open format (like ) from sources like OpenStreetMap rather than attempting to convert an encrypted .fbl file. 3. General GPS File Conversion Tools If you have non-encrypted
Ensure the IMG file has a valid map ID (FID). Some converted files lack this. Use Garmin MapConverter or MapSetToolKit to assign a unique FID (e.g., 31001). Also, name the file correctly: gmapsupp.img (for main folder) or gmapsup1.img (for SD card).
