The shallow water deal is in the works by the engineer's. Probably be another software update to correct it. When? No idea but as I understand HB knows about it and is working it.
I have the 898c and have no complaints as the extra inch just wasn't worth it ($) to me. They both have the same resolution so the Zoomed images should look better on the 898c. I doubt most can tell the difference if not in zoom mode.
If I want a bigger unit I'll go to the 1100 series. Now that's BIG!
BTW... HB Customer service has been top notch on these issues and others.