I'm in Deep Exploration, went up to Window -> Toolbars -> Measurements and I got what I needed.
Now, the question is, without getting too complicated, how do I quickly measure the entire length of a ship?
Computer Type: Desktop
Operating System: Microsoft Windows 8 Pro (64-bit)
Processor: Intel Core i7 (2nd generation) 3.07 GHz
Graphics Card: NVIDIA GeForce GTX 470