The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is 2°E, what bearing would you plot on the chart?

Question

The beam width of your radar is 2&deg;. The left tangent bearing of a small island, as observed on the PPI scope, is 056&deg;pgc. If the gyro error is 2&deg;E, what bearing would you plot on the chart?

Accepted Answer

Option C: 059&deg;. Radar beam width distortion causes tangents to appear offset by half the beam width (1° for a 2° beam). Subtracting this half beam-width error from the left tangent bearing yields the correct target center bearing, which is then corrected for gyro error to plot 059°.

The beam width of your radar is 2&deg;. The left tangent bearing of a small island, as observed on the PPI scope, is 056&deg;pgc. If the gyro error is 2&deg;E, what bearing would you plot on the chart?

The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is 2°E, what bearing would you plot on the chart?