File:DATAR double plot.jpg

Fair use, only known image of Royal Canadian Navy's DATAR system. Image of low quality. Iconic photo, would not find non-copyrighted equivalent.

Is claimed as fair use as:


 * 1) Is a historically significant photo.
 * 2) Is of low resolution and low quality.
 * 3) Adds significantly to the article.
 * 4) No free equivalent available.