What is the compass course to steer to make good a true course 002° if the variation is 4°E and deviation is 5°E
To determine the compass course to steer in order to make good a true course of 002°, you need to account for both variation and deviation.
First, let's consider variation. In this case, the variation is stated as 4°E (east). If the variation is east, you need to subtract it from the true course.
True course - Variation = Magnetic course to steer
002° - 4°E = -002°
Next, let's consider deviation. In this case, the deviation is stated as 5°E (east). If the deviation is east, you also need to subtract it from the magnetic course to steer.
Magnetic course to steer - Deviation = Compass course to steer
-002° - 5°E = -007°
Therefore, the compass course to steer to make good a true course of 002° with a variation of 4°E and deviation of 5°E is 007° (steer 007°). Note that although the result is negative, compass courses are usually given as positive values.
To determine the compass course to steer, you need to make a calculation considering both the variation and deviation.
1. Start with the true course: 002°.
2. Add the east or west variation correction. In this case, the variation is 4°E, so you will add 4° to the true course.
- True course + Variation = Magnetic course
- 002° + 4°E = 006°
3. Then, you need to apply the deviation correction. Since the deviation is 5°E, you will need to subtract 5° from the magnetic course.
- Magnetic course - Deviation = Compass course
- 006° - 5°E = 001°
Therefore, the compass course to steer to make good a true course of 002°, with a variation of 4°E and a deviation of 5°E, is 001°.