If you're going to be looking at maps often, the 1040 is just the 840 in a larger form factor. (I can't recommend the newer x50 series -- they made the screens

If you're going to be looking at maps often, the 1040 is just the 840 in a larger form factor. (I can't recommend the newer x50 series -- they made the screens a lot brighter, at the cost of significant battery life.)