Can anyone offer any advice on the following problem please. I have compiled my routes in BaseCamp and transferred them to the Garmin unit. When looking at the PC I can see that all the selected routes have transferred and are on the Garmin unit. HOWEVER when I turn the Garmin unit on not all the routes are visible, some are missing I have repeated the process, renamed the list, tried transferring single files, removed the SD card, restarted the computer and just about every other trick I can think of. Is there something I am missing? Has anyone else had this problem. We fly out next week so I am desperate to get this problem sorted. I tried contacting Garmin but they have wiped their hands because I am using T4A When I tried transferring routes 4 months ago when we first got the unit it worked fine.