If you prefer to submerge during daylight hours limit your speed to 2 kts, batteries will last until dark, but you won't get very far.I try to run surfaced until i start to encounter alot of aircraft and then i run submerged all day. As Magic said, if your outta Pearl fuel is a big issue and running submerged during daylight hours will keep a few more gallons aboard if your a long way from home and fuel is short.
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