En-Route Navigation: Off-Track Heading Corrections

Question 1

What is the closing angle?

Answer 1

Angle at which you will close on your required track

Question 2

For angles up to what degree can an equal heading change be made to rejoin track?

Answer 2

15 degrees

Question 3

1-in-60 rule principle

Answer 3

1nm subtends an angle of 1 degree at a distance of 60nm

Question 4

1-in-60 rule for 5nm off track at 60nm

Answer 4

5 degrees

Question 5

1-in-60 rule for 15 nm off track at 60nm

Answer 5

15 degrees

Question 6

1-in-60 rule for 5nm off track at 30nm

Answer 6

10 degrees

Question 7

1-in-60 rule for 2nm off track at 10nm

Answer 7

12 degrees

Question 8

If off-track and you make a turn equal to your estimated track error, what is the outcome?

Answer 8

You are fly on a parallel to your desired track

Question 9

Simplest calculation method for rejoining track

Answer 9

Track Error + Closing Angle

Question 10

To regain track in the same distance since you were last on-track, what must the heading change be?

Answer 10

A heading change equal to the track error (TE)

Question 11

To regain track in double the distance since you were last on-track, what must the heading change be?

Answer 11

A heading change equal to a half of the TE

Question 12

To regain track in half the distance since you were last on-track, what must the heading change be?

Answer 12

A heading change equal to double the TE

Question 13

Relationship between the required heading change and the distance to rejoin your track?

Answer 13

The greater the distance at which you wish to rejoin the track, the less the required heading change will be

Question 14

Inverse-Ratio Method for rejoining track

Answer 14

CA x inverse of fraction of the distance gone

Question 15

Inverse-Ratio Method: 1/4 of leg flown

Answer 15

CA x 4

Question 16

Inverse-Ratio Method: 1/5 of leg flown

Answer 16

CA x 5

Question 17

Inverse-Ratio Method: 1/3 of leg flown

Answer 17

CA x 3

Question 18

What is the primary limitation of the inverse-ratio method of rejoining your track?

Answer 18

It only regains track at the next turning point

Question 19

What must the heading change be when rejoining your desired track after flying a correcting track?

Answer 19

Equal to the closing angle but in the opposite direction

Question 20

1 minute standard closing angle for 90kts TAS?

Answer 20

40

Question 21

2 minute standard closing angle for 90kts TAS?

Answer 21

20

Question 22

1 minute standard closing angle for 80kts TAS?

Answer 22

45

Question 23

2 minute standard closing angle for 80kts TAS?

Answer 23

23

Question 24

1 minute standard closing angle for 70kts TAS?

Answer 24

50

Question 25

2 minute standard closing angle for 70kts TAS?

Answer 25

26

Question 26

An en-route diversion consisting of 60 degree turns will have what effect on distance flown?

Answer 26

The distance flown will be double that of the on-track distance

Question 27

An en-route diversion consisting of 60 degree turns flown for 2 minutes will have what effect on the next checkpoint’s ETA?

Answer 27

New ETA will be original ETA + 2 minutes

Question 28

An en-route diversion consisting of 60 degree turns flown for 4 minutes will have what effect on the next checkpoint’s ETA?

Answer 28

New ETA will be original ETA + 4 minutes

Question 29

My top thumb joint measures as what on a 1:500,000 chart?

Answer 29

10nm

Question 30

Why is 15 degrees a sensible limit for using 1-in-60 rule for calculating diversion headings?

Answer 30

A change of greater than 15 degrees entails a significant change in the wind’s influence on headings