80 degrees is mathematically most likely to intercept against the widest possible range of target courses and speeds. If you find it's easy to maintain your collision course you can narrow the angle to speed up the intercept without using up your batteries.
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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