Lately i've been really concentrating on being more precise reading a fish finder .. I've always been extremely good at estimating .. But with a fish finder , I'm not sure what i'm estimating distance wise .. Is there some sort of formula i could use on estimating exactly where them fish are ? Ex... Let's say my transducer is mounted in the back of my boat , I have a hummingbird with a 5" screen , There's 1 fish on my screen and it happens to be on the rightside of the screen , Therefor the fish is almost off my screen , Is there a way to guesstimate how far that fish is behind my boat ? And how far to the left or right of my boat's position could it be ? Thanks for your time !