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FM/BG-526 · v1.03
Milliradians: Ranging example 1b
- Code
- FM/BG-526
- Kind
- Guide
- Version
- v1.03 2yrs ago
- Views
- 421
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- As its document
- Published by
- LtCol James 25 Jun 2024
- Last material change
- v1.00
7 words added, 9 words removed. Title changed from "Milliradians: Ranging Example 1b" to "Milliradians: Ranging example 1b".
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.
v1.03
From [[525]] 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 Example 1a [[525]] we know the distance using the person's full height. However, 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 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 time, judging the balance of this is a skill, too.
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