When I run in fog offshore I keep it on 2 miles. I'm constantly zooming in and out. Double checking all marks against known bouys. Getting acurate double and triple checks against the chartplotter. If I see a mark I'll keep zooming in the closer I get to it. Untill I see it or it's passed. Constantly bieng aware where it's going, Where I'm going etc. It's tough to keep it on one set range. Inside the harbor I use 3/4 1/2 &. 1/8
You want to mark something as far away as you can and then range down as it appraoches.
As for finding birds unless you have a very powerfull open array forget it in any kind of seas other than glass. You'd do better with binoculars.
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