4.2.2.B.
When the Horizontal View Angle is bigger than the horizontal scale range (-40~+40 mils), a
vertical line splits (for example: mast, chimney etc.) on the object can be selected to make the necessary
estimated measurements in a step by step fashion. The sum of the value from each step is used to obtain
the measured value. As shown in fig 5, the azimuth of target (
cruiser
) is 130 mils (60+70=130).
4.2.3
How to measure the Vertical View Angle
4.2.3.A.
Vertical View Angle measurement is similar to measuring the Horizontal View Angle. When the
Vertical View Angle measurement is small, aim the cross center of reticle at lower part of the object, read
the scale value at the top of the object. As shown in fig 6, the angle included between the upper and lower
parts of the target (lighthouse) is 6 decade mils (60mils).