Weird - I wonder how it shows up in the game when it's invisible in the file?
At any rate, I got tired of trying to figure out how to see the game's ship marker so I just went into Paintshop Pro and mocked up my own sunken ship map icon, and I now have a very cool map of all my current Kaleun's sinkings. To avoid hi-jacking this thread any further, I started another thread about it, so you can see it here if you want:
http://www.subsim.com/radioroom/show...868#post313868
Now, if I can just figure out this transparent thing (or someone could post the file to make your sub disappear on your nav map as discussed in one of the previous posts in this thread), I'm definitely going to give this navigation technique a try - it sounds very cool.