Page Level Ads

Gyro Error Calculation

Find the gyro error if the setting sun was observed to bear 290° PGC at Lat 37° 10' S. Declination 13° 37' N.

Given:

     Latitude = 37° 10' S
Declination = 13° 37' N

What is asked?

Gyro error

Solution:

                Sin amplitude = Sin Declination
                                         Cos Latitude
                                     = Sin 13° 37' 
                                        Cos 37° 10'
                                     = 0.23542
                                        0.79689
                Sin Amplitude = 0.29542
                                     = 0.29542 inv Sin 
                      Amplitude = W 17.18° N          (West because the sun is setting)
                                          +    270°             (plus 270° because it is in the 4th quadrant)
                  True azimuth = 287.18°
                        per Gyro = 290°               (subtract to get gyro error)
                      Gyro Error = 2.8° W         (Compass best, error west; compass least, error east)

P.S. Like what you read? Please clink the share button below to share this post to your friends. Sharing is caring...

You Might Also Like

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)