Is there any way to update only a certain rectangle of satellite imagery?

[noone]

I have a large satellite map of about 24GB in size zoomed down to Z20/.25.

I want to update a 2 mile x 2 mile section with updated low tide imagery.

Is it possible to do this without having to redo the entire map?

[fjordfischer]

It is not possible to exchange the old images for new ones within the AT5, at least not for the user. But you can cheat by creating the 2 x 2 miles as a new second grid map and when you are in that area you can switch between each.