FM/BG-526.V1.03 - Milliradians: Ranging example 1b
From FM/BG-525 - Milliradians: Ranging example 1a we know the distance using the person's full height, however, you can’t always see a person’s whole body.
For reliability and to avoid a decimal (we want it easy for expedience after all), consider the person’s height from the top of their head to the crotch: it’s one metre!
- Head-to-crotch now appears as 3.2 mil.
- Round to 3 mil because we want it easy, so:
- ((head-to-crotch in metres) * 1000) / (mrad measured) = (range in metres)
- (1 m * 1000) / 3 mil = 1000 / 3
- = 330 metres
- We’re off by 30 because we rounded.
- Try to be as precise as possible, but we preferred ease of use this time, judging the balance of this is a skill, too.
Above: A man standing relaxed, measured head to crotch as a known dimension of 1 metre
