Picked up the Garmin 740S/Radar bundle and finally floated the boat first time Sunday, just don't tell my back surgeon

. Didn't go much outside Westport River mouth, but back won't take too much pounding yet, but initial thougts are SWEET. I were glasses for distance and I've not yet gone to bifocals, so it the usual on and off again for glasses, but that would be the same for any unit.
Anywho, radar ranges in the fog, I'm curious what ring range most feel comfortable with when running in the fog. I've got a 20 footer, which turns and stops on a dime, so I'm thinking close 1/8 mile or so. Then my other question is about gain, range and looking for birds, any tips on best range, gain and setting all that up. While it will be tough steaming away from working birds this spring, but I assume one of the best ways to learn this is from doing just that and then messing around.
Looking forward to getting out more and playing around once the run is in full gear.