After turning it on, I immediately made a backup copy of the "Garmin" folder, you never know, then updated the firmware 4.80 and the maps, the maps did not want to download, it bugged and it stopped the download, it doesn't matter because I don't use it.
I tried a JNX card of my manufacture, not recognized, I suspected.
I put the IMG cards of my manufacture and there "youpi" as we say at home, it's OK. So I would use these IGN topo maps.
I tried an unrecognized OSM map, I'll see later.
Already a bug, when I want to change a parameter the screen is cut in half, see below:
Menu Error
I am impressed by the number of satellites (nothing to do with the 66sr) and the accuracy is 1.8m like the 66sr. See pictures:
GPS
Galileo
GLONASS
BeiDou
On to the next bug......