Hi,

Yes, map tile limit is reached whereabouts 16 GB on my Montana so that my device can't read all topo maps on a 32 GB SD card.

But, if you use JNX maps, it doen't seem to have a map tile limit, because I have a 64 GB SD card filled with 50 GB of JNX which are all well displayed on my Montana.

May be, 1 JNX counts for 1 map tile ?