Just mentioning one thing that can throw you off easily if you are unaware of it: Rounding errors.
The hydrophone operator will report a bearing but that will almost certainly not be accurate but have in it an uncertainty of 1 degree. While 1 degree doesn't sound like much, it represent an uncertainty in position that increases with distance making any and all plots inherently inaccurate.
This comes down to resolution and how the game rounds off. The bearing is rounded down to nearest whole degree. That means if the operator reports say 273 degrees then 272, then the 272 degree report happens the moment the bearing drops below 273, which for all practical purposes is 273 and not the reported 272. If the report goes from 272 to 273, then the 273 report happens the moment the bearing hits 273.
In short: A bearing report of 273 means the target is anywhere between 273 and 274, report of 272 means between 272 and 273 and so on. The game does not allow greater accuracy than this.
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