I know Alt-Tabbing is not perfect, but it works. I normally use Sh3Gen at the beginning of a patrol to get briefed on the situation. Taking down some notes and preparing a plan in your head is recommended.
Some other suggestions from the top of my head:
-You can also exit the game but reloading takes much time ..
-You could use a second computer for the map only.
-It is also possible to use Sh3Gen when you're not playing on any older savegame you created before - no matter how old it is.
-Irish1958 suggested printing out areas of interest, the viewer has excellent printing / pdf function.
You might want to use it in between breaks if you play your patrols on several days.
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