I use the 4-bearing method. Had fairly good results. I recommend watching the youtube videos rather than purely reading his pdf file. His pdf file is not very well written and contains some confusing points (probably due to language issue). The whole point about this method is to use the first 3 bearings to calculate a 4th hypothetical bearing line. Then change course to triangulate the exact position, which should theoretically lie on the intersection between the hypothetical and the real 4th bearing line. The caveat of this method is that you need VERY accurate measurements on your bearing lines and time. When you do your map exercise you have to very exact. Tiny bit of measurement or drawing errors would put your final calculation miles away from the truth. I am not sure if you use full realism in your game settings. If you do then you won't be able to see the red sonar line on your map. Without that, your manual sonar readings would probably be off by a lot making your 4-bearing method virtually useless. I mostly use this method for surface runs. I only do visual measurements thru either binocular or periscope since sonar is not reliable.
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