If your asking about the Temperature Graph in the OP...
It's under the Sonar tab in the main menu system...
Rickie
Printable View
4920 x 2 = 9840' in fresh water....
How SONAR Works | Vexilar Fishing Electronics
I cannot find the effect to equate the 100° water factor...
I found this but it's more about salt water...
NAVAL SONAR - Chapter 1
Rickie
Here is where I found it
Water - Speed of Sound
I'm not sure why the 798 doesn't have this feature...
The manual for the 798 and the 798HD do not show this feature...but yet the manuals for the 800/900/1100 series units do show this feature...
I don't know ricky...maybe Greg can give us some insight when he gets back from vacation....
Rickie
Vacation? I’ve been tied up with training classes again! Now that it is doe there is some vacation time that I need to use up…
The Temperature Graph feature is only on the larger sized units, not the 798/798 HD sized units.
Thanx