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Originally Posted by USAMP1980
If you run with snorkel up and desiel engines running.. Also have both periscopes up.. one at 0, the other at 180. In daylight "aircraft spotted!" - Press D or C to dive and Ctrl Page Down (and respectively for Observation persicope) to auto-lower your scope(s). I have always managed to duck under before the bombs hit.
The snorkel makes a nice signiature for the Allied RADAR.
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Good advice about the pericopes. Don't to forget to Press X to lower your snorkel. And I wouldn't run at more than 6 knots until the snorkel is down, because IRL the snorkel would break at higher speeds.
Quote:
Originally Posted by USAMP1980
The best option is to look at the map provided with the game and go to the Atlantic between Britian and North America. You can find some nice spots that are far from any air coverage and along large convoy routes. They also often have a depth of over 1000 meters. If you have to, dive near crush depth where they can't find you.
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For me, the "best option" is to be more realistic. The type IX's were not often deployed to the air gap, except for their maiden patrol coming out from Germany to the French bases. The IX boats were most commonly employed along the North and South American coasts and off Africa. That's where mine go.
Quote:
Originally Posted by USAMP1980
Also keep in mind that cold water (and air) is denser, thus harder for anything to penetrate (hydrophone, SONAR, etc). Pick a nice ice-cold spot generally around Greenland and Iceland. You will have plenty of large convoys to chew up.
When need-be, run on the surface at night to the artic and grab your external torpedoes... just to return to your sweet spots.
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Sadly, I don't think the game models such temperature effects.
Quote:
Originally Posted by USAMP1980
I would not use your RADAR unless in a blinding storm. They have RADAR detectors too! 
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Agreed! And then only when hydrophones have determined there are no warships nearby.
Quote:
Originally Posted by USAMP1980
If you are running GWX3.0 , there are resupply ships and Milchecows that visit said area time to time. You could just stay out there. When you dock at a resupply ship.. it takes you back to the Officer's Office, but everything is disabled. You can only just go out on another patrol (refitted, resupplied, refueled). I have done this, as opposed to spending alot of time and fuel traveling to and from L'Orient. (A hazardous port). Also in GWX is Wolfpacks... you can sometimes find a pair of U-boats to join, and form an "Atlantic Wall".
Good Luck! 
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Wasn't there a thread about this recently? I don't think there is much evidence that u-boats made repeated trips to a milchcow on a single patrol. Once outbound and once returning was probably the max.
Unless GWX has disabled this, when you dock at a resupply ship some of the Office options are still available: Manage Crew (filing Cabinet in top left corner) and Game Options. What you can't do is modify your boat or your torpedo load out.
More simulation, less arcade game!