I bought a 997c SI last June and just updated the unit with the new down imaging. My original manuel doesn't have all of the updated info I downloaded into my unit. And there is no 997 updated manuels from Humminbird online. So I ordered a 998c SI manuel today from Humminbird's customer service. I Just thought I'd give others who have the older 997c another idea of how to get the updated manuel info thats not available online yet. The cost was $15.95.

This should come out as a free download soon.

I agree that these updates will eventually be able to be downloaded. But it's easier to have everything in the manuel when I'm in the boat. I'm just passing this info so everyone knows there's an option to getting their manuel updated. I also want to tell everyone that the Humminbird customer service was fast. I ordered the manuel and got it 2 days later.