What has been shared is the gmap folder for use with a PC.Its output is a custom map file (.img)there are no additional files including jcv, these are only available when updating the device with Garmin Express.
There are multiple sizes & format junction view files each for different group of Auto devices, they are version linked, these are the most common
JCV 13xx 14xx (Small):SVG Junction View Pictures size:480x270
JCV nuvi 13xx-14xx 765 (Large):SVG Junction View Pictures size:480x270
nuvi-Drive 4x 5x & StreetPilot :Android Raster Junction View Pictures size:212x234 (No longer supported by Garmin)
PhotoReal:SVG Junction View Pictures size:212x234.
For best results when posting say which device you have, then another member with that device can help.
Please read our
RulesParticularly 8 & 11 so far