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FM/BG-526 · v1.02
Milliradians: Ranging Example 1b
- Code
- FM/BG-526
- Kind
- Guide
- Version
- v1.02 2yrs ago
- Views
- 421
- Platforms
- As its document
- Published by
- Capt SkullCollector 31 Mar 2024
- Last material change
- v1.00
1 word added, 1 word removed.
v1.01
From Ex 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.
v1.02
From 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.
From Ex 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.
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