make sure hes in a support slot
make sure he has 90% of his sailors on him (or more than 90%)
make sure youre not screwing anything up in the measuring
Dont bother measuring underwater time, the only thing that changes that is what tier sub you are in.
EDIT:
Originally Posted by mrebb86
You have to have a planesman to run a sub.
When he gets to a higher level you will start battle with full tanks.
Both of those statements are untrue in some way. He is not required to run a sub, but he is required to run one effectively. He does NOT have to be high level to start with full tanks, he has to have at LEAST 90% of his total sailor capacity full (it might be 90% of his total rookies full, but i dont think so).