The depth gage is not very accurate; one bar would be surface, 2 bars, medium depth, maybe 2-4 inches
and 3 bars deeper than 4"... This has been my experience so far... When pinpointing the depth is shown in numbers,
but mine seems to be most accurate when I apply x 2 to each number.... 0 is obvious, 1 is about 1 to 2..
2 is about 2 -4 inches, 3 is about 4-6 inches and 4 on mine is beyond 6 inches...
I really don't pay much attention to the depth meters; the volume is depth specific and you can usually tell if
it's a surface target by the sound... A coin on the surface will be loud, and one at 3 inches will be softer
and another at 6 inches will be even more soft...
Good luck with your F-2.. It's a fun machine to use.... HH, Jeff