Best 'actual' snapshot & long-range shot techniques?

[Elphaba]

Originally Posted by derstosstrupp

Enter the Ausdampfverfahren! I outline that method at the end of the document but basically, you achieve a constant bearing to target (I.e. collision course) over a few minutes, note that bearing and own speed and his eyeballed AOB, and derive his speed:

Own speed x sin(bearing) / sin(AOB)

The bearing change method over a minute is another option, but you need a range at first bearing as well as the other info as above, in which case simply guesstimate the mast height (30-35 is a good avg I think). These methods are a check on the data gleaned from overhauling in my tutorial, but they can be used on a standalone basis in a pinch by all means.

I think you misunderstood; I was already referring to those two in my question; I was asking about ADDITIONAL historically accurate techniques for when those two aren't applicable i.e. you can't get in front, or you're chasing from behind, or you just need to snap off two fish with no calculations - just some 'trick' or 'eye-balling'...