"What you want to do is set the subs on a patrol mission with boundaries. Same way you would set a surface group to patrol an area....GP "
Actually I do not patrol, I want them in a certain hex.
That way they do not use fuel... or much fuel.... and can stay at sea for far longer.
Then give them a patrol zone of only 1 hex. Your chances of engaging the enemy are greatly reduced, however. Also, moving reduces detection level. If the submarine is detected stationary, it will be more difficult to lose detection level. A submarine that is detected is rarely able to attack.
In December 1941, your submarines, especially the Dutch subs, are your most effective weapon. Use them to the best of their capabilities. Do not worry about fuel. Submarines do not use a large amount of fuel. Now all those BBs at Pearl... that is a different matter.
Those "one hex" zones can be useful especially around Formosa, Manila, and near major ports because those subs are also "spotting units" and will also rescue downed friendly pilots...
Near enemy ports is the last place that you want your subs stationary, because they will probably be in aerial search patterns, which will raise their detection level each time a search plane passes over them. A TF losses 1 Detection level per impulse. So, overnight, a sub will lose 2 DL by the next dawn: one for the night impulse and one for the AM impulse. Each hex moved will also reduce DL by 1. If a sub is stationary near a port, it will probably accumulate more than 2 DL during the daylight hours. Therefore, it will always be detected, rarely attack, and be an easy target for ASW TFs.
To give you an example, in my current game, an allied submarine near Truk took a critical hit on its fuel tanks. It lost all of its endurance almost immediately. It sat there stationary for 7 days, and was attacked by air and by ASW TFs almost every day. It was hit twice by search pilots with rank 20 ASW. The point: do not sit stationary by enemy bases.
< Message edited by Aurorus -- 5/16/2017 4:02:23 PM >