Your asking the crew to find targets for you is like asking them to fire the deck gun and expecting a hit every time........it won't happen.
You want a kill with the deck gun without using all your ammunition.......do it yourself.
You want to use the radar to find targets........use it yourself.
Same with sonar......use it yourself.
The game take's into account your crews efficiency points, among several
other things, to render a percentage of success in what its tasked to do. Having a radar operator finding the same targets you'll be able to do is dependant on his skill and efficiency rating. A green crew is pretty much useless.
One thing I didn't change with the radar was the variables the crew efficiency factors have on their task of reading radar. Maybe I should have, but then you wouldn't have the fun of using the radar for yourself!
Thinking about it, if you became dependant on the crew to do all that's expected of them, the game might as well not have the Deck Gun, Sonar Station, Radar Stations available for user control. You could sit back and let the crew do its thing, while you just shout out orders. I think we would grow tired of the game very quickly.