From: US Midwest
There is very little you can do about this initially, but once Norway belongs to Germany and the convoy route changes, a maritime bomber will drive away the Royal Navy. You will get 2 attacks on Royal Navy ships every turn, and your opponent will end up spending more to replace his ships then he is taking from you with convoy raiding. As soon as they realize this, the raids will stop.
It sucks to have the Germans spend precious mpp's on a maritime bomber, but when you get your 40 mpp's per turn back from Norway, it will pay for itself very quickly. Once the Royal Navy gives up on Norway, you can move the Maritime Bomber to the Med, where it can be very useful indeed. Once the USSR is in the war, it can also be used to raid the Arctic Convoys.
This cheap air unit can also be used for recon missions that you don't want to use up a bomber or fighter for. Once you get a couple levels in Long Range Aircraft, they have a vast range, similar to that of a heavy bomber. Is that National Morale City empty, and vulnerable to amphibious attack? Use a maritime bomber to scout it. Is there an armored formation behind my enemy's front line, waiting to counter attack? Use the Maritime Bomber to fly the recon mission, it is cheap to reinforce and you don't waste an attack.
It's something to consider. Getting the 40 points back per turn from Norway makes the Maritime Bomber a worthwhile investment, even if you never do anything else with it.
Lock up your wife and children now,
It's time to wield the blade..