How to Find Back Bearing from Fore Bearing ( WCB & RB )

Summary

This educational video script teaches viewers how to calculate back bearings from four bearings in both whole circle and reduced bearing systems. For whole circle bearings, the formula involves adding or subtracting 180 degrees based on the initial bearing's value. Reduced bearings are simpler, requiring only a reversal of directions while keeping the angle constant. The script effectively guides through the process with clear examples, concluding with a reminder of the key differences in finding back bearings between the two systems.

Takeaways

• 📚 The session is about learning to find back bearings from four bearings in navigation.
• 🔢 In whole circle bearings, the formula to find the back bearing is 'back bearing = four bearing ± 180°'.
• ➕ Use the positive sign for four bearings less than 90° and the negative sign for bearings more than 180°.
• 🔄 For bearings less than 180°, add 180° to find the back bearing; for bearings more than 180°, subtract 180°.
• 🧭 In reduced bearings, finding the back bearing is straightforward by reversing the direction.
• 🔄 Reverse directions in reduced bearings: North to South, East to West, and vice versa.
• 📝 For the given bearings, back bearings are found by reversing the direction while keeping the angle the same.
• 🔄 Example: South becomes North, East becomes West, and West becomes East in back bearings.
• 📐 The angles remain identical in both four bearings and back bearings, only the direction changes.
• 📈 The process is demonstrated with examples to illustrate how to find back bearings from four bearings.
• 👋 The session concludes with a thank you note for watching the educational video.

Q & A

What is the topic of the video?

The video is about learning how to find back bearings from the four bearings in both whole circle bearings and reduced bearings.

What are the two types of bearings discussed in the video?

The two types of bearings discussed are whole circle bearings and reduced bearings.

How do you find the back bearing from a whole circle bearing?

To find the back bearing from a whole circle bearing, you use the formula: back bearing = four bearing ± 180°, using the positive sign if the four bearing is less than 90° and the negative sign if it is more than 180°.

When should you use the positive sign in the back bearing formula?

You should use the positive sign in the back bearing formula when the four bearing is less than 90°.

When should you use the negative sign in the back bearing formula?

You should use the negative sign in the back bearing formula when the four bearing is more than 180°.

How do you find the back bearing in the case of reduced bearings?

In the case of reduced bearings, you find the back bearing by reversing the direction. For example, if it is North, write South, and if it is East, write West.

What happens to the angles when you find the back bearing in reduced bearings?

In reduced bearings, the angles remain the same when finding the back bearing; only the directions are reversed.

How does the direction change when finding the back bearing from South to North in reduced bearings?

When finding the back bearing from South to North in reduced bearings, the direction is reversed, so South becomes North.

What is the relationship between the four bearings and back bearings in terms of direction in reduced bearings?

In reduced bearings, the relationship between the four bearings and back bearings is that the directions are opposite, while the angles remain unchanged.

What is the final message conveyed at the end of the video session?

The final message is a thank you note for watching the video, indicating the end of the session.