C:\User\USERNAME\AppData\LocalLow\Iron Wolf Studio\Destroyer The U-Boat Hunter
Scroll down the list. Most recent save games should be at the bottom.
Click on the value to open a drop-down selection.
At any time after starting a battle, press ESC to open the In-Game-Menu.
At any time after starting a battle, go to the Sonar Station and press the true/relative bearing button (compass icon) on the right hand side.
Sure you can ... you will have to play the tutorial again, though. We don't have any shortcuts (yet) - sorry.
Could not find your problem? Please read the general FAQ for common problems and solutions regarding multiple games.
FAQ, Patches, Savegames, and - tada: the community.