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Well if it's farther than you can see, then go by the sound contact. drop down and let the sound guy get a line on it, then simply observe that line for a bit.
Put a marker right at the tip of that line, and then see where the tip moves from that point. then simply draw a line with the ruler to establish the course. You can also determine the distance as well with the ruler.
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"Chance favors the prepared mind"
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