Step 2 calibrate the map

3. Determine the traveling direction of the covered target.

4. Estimate the target distance.

5. Measure the pitch angle.

Measure height

-Estimating the target distance

-Distance estimator ranging

-Coordinate ladder ranging

-odometer ranging

The Sixth Five-Year Plan (Type 65) military compass is a basic equipment specially developed for individual soldiers to meet the needs of combat. It has the functions of measuring azimuth, distance, level, slope (pitch angle), height, marching speed and drawing simple maps.