Many of the older pre war skippers followed the pre war doctrine that most used well into late 42 and into 43 of running submerged during daylight when in patrol area or near Japanese airbases and running on surface at night to recharge batteries.This made subs a slightly mobile minefield and targets had to come to you.New breed of skippers decided to run on surface, using radar and diving for attack or evasion.If a plane came along, they would dive, then surface a few minutes later.This proved much more effective in finding ships and extending patrol time since there was less recharging of batteries.Recharging batteries uses fuel, esp in the game.
Unfortunately the devs did not give us four engines as fleetboats really had, you have two but are labeled 1 and 3 and 2 and 4 in the game, but they are just two engines so cant run 15 knots to patrol area, then have plenty of fuel to stay on coast.In mods like TMO ahead standard will give you 10 knots, best speed.
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