The above plot reminds me of one small task I completed sometime after my first Korean Adventure for Ship Analytics. I rewrote the software that generated the above plot. The major upgrade I implemented was the ship outlines (the red and blue tracks) were to scale and I tweaked how coastlines and navaids were plotted. I also changed the code to interface with other HP plotters (HP 7550A, HP 7585B, etc.). I wrote this software in C on a VAX/VMS computer.
Here’s some plots from the new version of the software (via A Study on the Correlation between Shiphandler’s Subjective Evaluation and Maneuvering Risk in Curved Narrow channel):