yeah U49.. just a few minutes ago saw that very scenario. I was down listining until my air was about two then I just surfaced straight up & sat there gathering air when all of a sudden that little voice said "Batteries 100% sir" Kind of surprised me because I haden't run the power plant.
What I have been doing is to submerge, go 3-4 kts until the batteries are 50% & then surface & run at 1/3 until they are recharged...Your right though, it is a slow way of getting somewhere, but you can stretch your fuel quite a bit that way.
I still don't know why I can't get the proper manual knot setting on the surface though.
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