With auto targeting the torp will go more or less where you point the crosshairs of the scope. Aim at the bow you should hit the bow, aim at the stern you should hit the stern. As a matter of fact its almost too accurate. Given of course you remember to open the doors first, about 5 seconds of delay for them to open (again too fast but whatever).
The 'offset' for example 5 degrees left the torp starts at the centerline of the crosshairs and continues out on a path deviating 5 degrees to the left of the crosshairs.
The reason for the green triangle is to show you have a 'good' solution not requiring a large amout of gyro turn. The reason it snaps to center of the ship when you 'lock' is that basically it gives you the 'best chance' of hitting. But you could leave it locked on center, offset one torp a bit to the left, another a bit to the right and therotically hit one in the bow and the other in the stern. Frankly I almost never use offset with autotarget on. I just set the crosshairs on the bow of the boat and when the section that I wish to hit (typically just aft of the stacks) passes the crosshairs I fire.
One thing the 'auto target' does not do well is judge the depth of vessels. It nearly always plots it too deep. I typically set the torp as shallow as it will go, fast speed, and impact trigger. If you do want to try an under the keel detonation check the vessels draft in the recog manual first and verify that the auto has the torp set for only a foot or so beneath, not 2 or 3 like it typically does.
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