Your radar has a beam width of 2°. The radar gyro bearing of the right tangent of an island is 316°. If the gyro error is 1° E, which true bearing should be plotted on the chart?

To determine the correct true bearing to plot on the chart, the gyro bearing must be adjusted for gyro error. In this scenario, the radar gyro bearing of the right tangent of the island is 316°. Given that there is a gyro error of 1° East, you need to adjust the gyro bearing in a way that accounts for this error.

Gyro error adds to the true bearing when it is labeled as "East". Therefore, to find the true bearing, you need to subtract the gyro error from the radar gyro bearing. In this case:

True bearing = Gyro bearing - Gyro error

True bearing = 316° - 1°

True bearing = 315°

However, 315° is not one of the options given. It seems that the purpose here is to identify the closest value available based on the provided choices. In practical navigation, if the radar beam width is 2°, this means the radar can receive information on either side of the direct bearing. Therefore, it could be evaluated within the context of being slightly to the right of 315°.

Thus, while technically not an exercise in simple subtraction, if you interpret the adjustment and broadening of the radar's beam width, you might