How I operate depends on the period of the war and the area, much as it was in RL.At the onset of the war through 42 I submerge during daylight with occasional periscope sweeps and use sonar to make contacts, if need to surface to close target I will.This follows early war doctrine.
Around Jan 43 or so I begin using night surface attacks at night(obviously) and still patrol submerged during daylight with surface patrols becoming more common as the year wears on.Mid 43 till the end I patrol on surface and dive only when have to, to avoid planes, attack etc. Exception to this would be that of RL when patroling close to shore or in Sagami Bay etc
I run TMO with RSRD and when with SubPac I patrol the Japan-Mariannas-Truk lanes often in 43 and 44, Japan-Luzon, Formosa Straits often, sometimes hang around the Tokyo area if assigned.Late 43 into 44 Rabaul-Truk lanes are busy.
When out of Australia I go where assigned but favorite areas are off Northern Luzonor just outside southern formosa straight.Coast of Indochina is pretty fruitful usually as well.October 44(do this from both commands) China coast is packed with convoys but shallow waters and enemy radar can make it challenging.
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