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Taken from the pages of the hnsa.org website, this is a reconstructed version of the Mk I Model 3 Submarine Attack Course Finder Manual all ready to print out.
It makes a 16 page book that explains how to use both sides of the tool to solve a variety of course plotting and manual targeting problems.
You can find the sheets to print, cut, and assemble into your own Mk I Model 3 SACF by going to www.hnsa.org/doc/attackfinder/.
Just be sure to make the two smallest disks of the course finder (attackfinder-xxx.pdf pp 3 and 4), and the smallest disk of the speed calculator (iswas-3.bmp) from transparent material, as you need to see thru them to use the tool.
NOTE: It may not be obvious, but the periscope card on the attackfinder goes under the enemy card. That's why both need to be transparent.
Here's a thread where subsimmers discuss the building and use of this tool.
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