hi, Just a heads-up for anyone who is going to update FW on the 1197.
I think (well this is my assumption) that safest way of doing a FW upgrade is by using the memory card and not the humminbirdPC. I got stuck halfway with an error message saying "firmware error". It took a number of attempts and couple of pretty stressful hours until I finally could get the 1197 connect to the PC while at the same time having the test menu open on the screen of the unit (which seems to be the only way to go) and got the original FW version loaded. Eventually I used the memory card for upgrading to 4.570 and that worked just great.
So lesson learned, never use the humminbirdPC for upgrades..