Hope GTR GPS experts can help. I use a Garmin 276C on bike trips - its a marine chart plotter and only GPS available 10 years or so ago that was waterproof and could handle routable road maps - yes was an "early adopter" of GPS on bikes and still think they are fairly essential for a good trip - not forgetting hard copy maps as well! It served me well on European tours utilising Garmin maps loaded via MapSource. I now want to use it with the GTR map and will have to use BaseCamp. The 276C is not recognised by BaseCamp, JaVaWa nor my Mac (10.9.2) as a USB mass storage devise - in fact any Garmin update (the same form factor is still used with GA GPS units) has to be done via a Windows machine. I say not recognised as USB storage device but it does show in BaseCamp under My Garmin Devices and can say transfer routes. The memory sticks used are old style proprietary Garmin ones so cannot load map on to these via a card reader. I have been through various trials (utilising info from other GTR posts by Oddvar and Heilong) inc loading map via JaVaWa on SD card and getting my 205W to read it successfully. I have also looked at some of the specialist GPS forums but they are much too technical and more to do with complexities of POI's and creating maps - all I want is a routable map of Thailand. I do not mind putting map onto my Mac hard drive. Any suggestions? Thanks!