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Powerthighs,
I get what you're saying but wouldn't the same thing be accomplished by drawing those same lines and laying the compass rose, right-side-up ('zero' to the top), centered over your sub? You would still get the true bearing where the line intersects the compass graduated markings (i.e. the line would pass through the top, right 45 degree marking).:hmm:
Either way this would only handy for manual navigation. I don't see a use for it other than that.
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Yes, you could draw the line first and then use the compass to see what the line's true bearing is, adjusting it if necessary. Where the inverted compass helps is when you are drawing a line at a specific true bearing from your sub, say 47 degrees. You place one end on your sub, then as you move the line outward you can place it exactly at 47 degrees before you click it down. Otherwise you would have to make a best guess with the line, pull out the compass, and adjust the line to cross 47 degrees.