Interesting convoys should travel on precise routes. It's possible to fire-up special charts on your map, also the general convoy traffic charts, this should help to have a 'generic' idea of where to find - or better say: have a chance to find - convoys, enemy ships etc.
Depending on the date, NW of Ireland is prime to find convoys, or E from Bergen-Trondheim in Norway. Or NW of Gibraltar straight. But be sure to avoid shallow water locations for the attack.
Don't forget that once you are finished patrolling your area you are free to patrol wherever you deem it useful, so do it.
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