as I read it, it only has 1 year warrenty (2) you can't up grade from the internet.

As for the warranty buy the service plan from cabelas. even if you drop it they will replace it. I found out the hard way on that one when my wife dropped my hds. i thought i puked up my heart. scratched the crap out of the screen. No questions asked i had a new unit.

AS far as upgrading the way you do it is you need a 2 gb sd card blank from the camera shop and a card reader about 20 bucks for both. when you do need to do an upgrade you plug the sd card into the reader and plug that into your usb port on your computer. go to lowrances website clikck on support software then select your model. click to use the lowrance installer. it will do the rest. Come back half hour later take the sd card out to our boat put the sd card in and turn the unit on. wait five minutes and the unit will reboot telling you to remove the card. it is that simple.