This is my procedure of loading the maps onto the Rino650:
1. In Mapsorce, select required bluechart maps with maptool then transfer to card/internal memory of unit.
2. In My Computer, open the destination and rename the xxxxxx.img to bluecharts.img
Do the same with other maps e.g. Topo and Tides - renaming them as you go.

Now when I disconnect the device from the PC, turn it on, go to the map setup I can clearly see the 3 maps I have just installed. But, when I disable all except Bluecharts, it opens up on the unit but appears to be mixed up with Shonky Topo!!!
I'm beginning to think it may have something to do with Mapsource?