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Advanced Course and Depth Control

The following is already implemented:

If you hold down the shift key, clicking the Course Change 90° button will initiate a 45° turn instead.
Holding down the control key will result in a 5° turn.
And finally, if you hold down both shift and control at the same time, the course will be adjusted by 1°.

You can now use the arrow keys to adjust your course. Left arrow for 90° port, right arrow for 90° starboard, up arrow for rudder amidships, and down arrow for a 180° course change.
These work in conjunction with the course adjustment hotkeys, so shift + left arrow will change your course by 45° port, and so on.
You can disable these hotkeys by pressing control + capslock. This will act as a toggle.

While holding the control key, press F to increase your depth by 5m. Holding shift alongside control will change that to 1m. Pressing R instead of F will likewise decrease your depth.
Holding control and pressing both R and F will keep the current depth. (currently bugged, sorry)
Increasing depth while on the surface will flood the tanks, and going to 0 depth will blow them.
Holding control and pressing P will put you to periscope depth, while holding control and shift and pressing P will set your depth to 20m.
Holding control and pressing C will initiate Crash Dive when you're surfaced, or initiate a dive to maximum depth when you're submerged.

Holding control and pressing space will launch the torpedo from the periscope UI, as if you had pressed the "Los" button. Currently only works when the UI is open, I'm looking into bypassing that.

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This is fully save game compatible and will uninstall cleanly.

• I want to add an UI element, like a text box, to the compass that allows you to enter a specific course. That way you could enter "313.3" into the compass using your keyboard to set a precise course to 313.3°.
  
• I'm thinking of implementing a "keep 5 m off sea floor" feature.
  
• I want to add an alternative dive schedule, where the boat dives to 50m while it's active, instead of just periscope depth.
  
• Hotkeys for the engine presets and the rudder.
  
• Hotkey for emergency ballast blowing.

Please leave a comment if you feel like something needs changing!