[mookiemookie]

I submerge to 20-25 meters, order all stop and manually spin the dial a couple times myself (use shortcut key "H" to man the station yourself) on 1x TC. If I'm feeling lazy, I'll go out for a smoke or something and leave it on 1x and let my operator listen.

In open seas, I submerge at dawn and dusk. In areas of heavy traffic (off the coast of a port, or in a shipping lane) I'll submerge at dawn, noon, dusk and midnight.

Also, radio/sonar qualification is the first one I give out after my first patrol, as I usually have at least 1 watch qualified officer to start with anyways. Always pays to have good eyes and ears.