I consider it good enough for preliminary sightings. Remember, precision is not necessary at that range. All you are trying to do is put your sub in the ballpark for a successful approach. As things get closer together you can worry about precision.
You are just trying to bring target and sub together on converging courses that will put the sub in attack position. This is plenty good enough for that. It's an approach strategy, not a shooting strategy. As such it's useful and belongs here. It's easy enough by inspection to determine whether you are on a converging or diverging course. If you find yourself diverging it is entirely possible that no attack is possible.
Good contribution!
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