There is a manual for Ship Simulator Extremes, there are many things in the game that aren't obvious and perhaps it will help to access it! It is well hidden within your PC though when you purchase the game via steam.

To access it navigate through your folders as follows:

Computer > Local Disk(C:) > Program Files (x86) > Steam > Steamapps > common > Ship Simulator Extremes > Projects > ShipSimExtremes > Docs > EN > Manual_ShipSimExtremes.pdf

There is also a ES and US folder and a Mission Editor folder leading to a MissonEditorGuide.pdf

Hope this helps someone :)