Hi fella's

I've had a Montana 650t for ages and have only recently picked it up again to use while hiking.

I have a few question on its use with maps etc. Here goes.

Is it faster to use one map per card rather than jamming a load onto one card?
At present I have a lot of maps on one card but its sloooooow to reveal the map

How do you fellas mark your memory cards up?
I cant make any sort of legible text on the cards,

Is it faster to put small maps onto the internal memory?

Can I remove the base map from the device to make room for another map and replace it if I need it?

thanks for any help