You air radar is always on regardless, unless dived or broken. It doesn't cut off. You can control you surface radar off and on, but it has no effect on air radar. Haven't played stock in so long, but sure you can raise the air radar at scope depth with the t key.
Why early war tactics they ran submerged during the day, most skippers quit that. They actually trusted their crew watches more than radar, but with both, most skippers stayed on the surface during the day.
You also want to always run at about 9-10 knots, anything else you're wasting fuel.
Problem with stock, too many planes at an unrealistic level, so almost forces you to stay submerged. Mod's fix all those silly stock bugs.
If you haven't read the SHIV guide yet I would do so. I'll have to go find a link, but will post it later.
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