The thing I'm confused about - doesn't Map Contact Update give you much of your target data free of charge? The way I see it, automatic position and course plotting gives you Range and AOB information free. Then you just have to get ahead of them and abeam. Speed estimation is required, but that could come from the radio report. In real life, skippers had to plot target position as an estimate - but with Contact Update on, you get truth, right?
Kb
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