by Buddyboy » Sat Jun 28, 2014 6:46 am
The 2015.10 map's full screen D1279220A.JCV for US & CA only [no MX] is about 780 MiB [818,553,331 bytes] so I suppose if '780K' is a typo then that's the one you downloaded.
In 765 the *.JCV file will work in either the Garmin folder or in the sub-folder JCV within the Garmin folder. However, if you leave the file in the Garmin folder it will not be automatically removed should you update maps with GarminExpress or MapUpdater and therefore the newer file placed in the JCV folder maybe will have it's correct operation interfered with by the older version still in the Garmin folder. Best to only use the JCV folder is my advice.
The smaller '30K' [maybe 30MiB?] JCV file you mentioned might be a 'full screen Lite version' leftover from another earlier map, if you post its file name we can check what map it belongs to. Probably best to just remove it anyway if you haven't already.