Periscope ranging seems ridiculous....

[AVGWarhawk]

In the precise prose of the era, "The basic principle of Surface Vessel recognition as with aircraft is familiarity with the total form of the object observed. The true character of a ship is not determined by a single feature or features, but by the familiarity we may have with the total mass of the hull and the superstructure, when viewed from great distances. ... The salient recognition characteristics are shown in their simplest form by silhouettes. ... In ship recognition, the use of beam, or side view silhouette, is by far the most important. If the beam silhouette is thoroughly known, the ship can be recognized from either the surface or the air."

http://acepilots.com/ships/main.html


Are you selecting the correct vessel from the recognition manual? Wrong vessel will screw up solution for sure.