Thread: Garmin Express won't instal map update to SD card

No MapUpdater for Mac it's Win only software, sorry i forgot.

I was hoping to have a Garmin App do the install to the SD card so that when I download 2015.40 from the Garmin site it goes to the SD Card. If I manually copy the files I'm not sure how it can do the update as there wouldn't be enough room on the internal drive but there wouldn't be a recognised install on the SD card?

Well, you can do that with GE as I said in point 2 above. To further explain, when the Garmin software [eg: GE, MI, WU] sees a valid GarminDevice.xml file on a flash drive or media card it will assume it to be the actual device and treat it accordingly. It's often referred to as 'a fake nuvi', i like to call it 'a nuvi stunt-double'. The advantage of using the actual intended unit's microSD in a usb card reader is that you then have to do minimal moving/copying of files. Some you will have to move to the unit as explained before and others can remain on the card but moved almost instantly just to appropriately named folders. Maps and gma/unl codes can stay on the card and best to keep them in the same folder you use for their associated map's storage. In Garmin folder for 3590 on card, not only will gmapsupp.img be recognised but also 'any_name'.img eg. CNNTU_EU_2015-40.img. You should rename the associated gma/unl files the same as the img name of course. The map 'anyname' is also usable in a separate 'Map' root folder of a card.

PS anyone know what map files gmapbmap.img and D2249750A.img are?

The first is the basemap, it'll work in the card but better it remains on the unit. D2249750A.img is the stupid name that GU gave to EU DEM map when it loaded it back to units from which gmapdem.img had been mistakenly wiped in an earlier update. Rename it to gmapdem.img if you leave it on the unit. It can be used on the card in Garmin or Map folder as gmapdem or anyname including D2249750A i think. See [Only registered and activated users can see links. ] for further info.