Assigned patrol grid square, do you stay or do you go?

[Englebert Endrass]

So what strategy do others use.
BdU give you your assigned patrol square. You've reached there and you've been there the required 24 hours.
Do you move on based on intelligence or guessimetric?
Or do you stay in your allotted square only venturing outside if assigned by BdU, say to intercept a convoy, or if you pick up a contact and go outside the grid square during the chase?
Personally I tend to adopt the latter on the basis that by not being in the square you might upset the grand plan, should there be one of course. If the pickings in the patrol area ae particularly lean then after a few weeks then off we go a-hunting.
Also on your way to your square do you choose a route that will get you there as economically and stealthily as possible (my technique), or do you go into high traffic aeas to increase chance of contacts? Tend to do this on return journey to increase intelligence with contact reports, no idea if this earns you brownie points or extra renown but seems to me to be the obvious thing to do.
Just wondered what others do.