When installed the map or preferred part of map can be sent to the gps with Mapinstall or Mapsource if it is an older map. img file with gmaptool and the install it to your pc (this is from a windows pc horizon, with Mac your hands are often strapped to your back unfortunately). If you are not to use the address search you can split the. I also have a 276C, also as a motorcycle gps, and I would solve your problem with the following methods. Use this tut as a guide by simply replacing the region as '0A' instead of '03' for the basemap: The actual map img naming commenced with isn't important as noted in the thread. Otherwise, if you can connect to PC and use Updater.exe you can flash the map as an rgn file to region 10. If you have a Garmin proprietary datacard writer, you can simply copy and paste the unlocked image file to it after renaming it gmapsupp.img. I think your unit can only have the basemap on the internal memory, and the only detail map is on the data card named gmapsupp.img in a Garmin root folder. It works for old StreetPilots such as c3x0 with an SD and 26x0 which have a CF card. Maybe it will work if the map's renamed and the path etc in command prompt is changed to " /i /autorun usb /upload_file rgn=10 path= " but i haven't tried it on a 276C. This one is for units which can have gmapprom.img on the internal memory. There are existing threads here, maybe a little hard to find easily exactly what you're looking for. The GPSMAP marine plotters and aviation units can have map info loaded in other ways. MapInstall will only load map data to it from. Unfortunately you cannot load a detail map image file using MapInstall as you've found. If I have to I could use a Windows machine if it is just not on with Mac. My 276C by the way is recognised by BaseCamp and can download tracks from it. I have tried randomly renaming the file gmapsupp.gmap and country.gmap (indicating my level of knowledge!) and in MapManager they are recognised and after clicking Install Map window comes up “Maps installed successfully” but do not show up. If in MapManager I go File, Install Map the file gmapprom.img is greyed out. I have loaded the file as gmapprom.img on SD card in folder called Garmin and BaseCamp recognises it but it is not recognised by the (separate in Mac version) MapInstall nor MapManager. The map I have been provided is in gmapprom.img which I understand is the unit base map not the supplemental map gmapsupp.img I have in the past loaded an OSM map onto my 276 but think I used a Windows laptop and cannot remember the work flow. I use a 2012 Apple Mac (not USB3) with BaseCamp (it was all much more simple with MapSource?). img file and cannot find a way of loading it onto my non USB mass storage unit despite looking at forums and using various add on converters. It also has a very good battery life (I suspect this is a deliberate safety feature for when use in marine or as the same form factor x9x aviation series) compared to modern units something which is a big advantage when renting bikes. I have a 276C which I use for motorbike tours – when I started touring it was the only portable waterproof GPS that could do road routing.
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