In addition to these measurements, you will need to know the number of mils in each reticle of your binoculars refer to your reticle binocular specifications. Just remember, a small change in height translates to a large change in horizontal range estimation, so it is essential to measure heights accurately Drop the weight over the side, until it reaches sea level, mark the string, and then measure the distance from the weight to your mark. If the information is not readily available, use a plumb line, which is essentially a weight on the end of a piece of string. What you need to know:īefore you start, you will need to do some measuring.įirstly, measure your eye height whilst wearing work boots, and then the height of your observation platform. For information on range sticks, please visit our website. Reticle binoculars and range finding sticks are the most common methods used, but it is also possible to use a sextant.ĭemonstrated here, is everything you need to know about estimating range using reticle binoculars. An essential skill for all Marine Mammal Observers is the ability to estimate range to a sighting.
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