Navigation

What are methods of getting Ship Position if GPS fails at mid sea?

  1. By Astronomical object.
  2. A Bearing and Sounding
  3. Running Fix.

By Astronomical object

 Six common methods are used :
  1. Latitude by Polaris (Pole Star)
  2. Latitude by meridian altitude
  3. Latitude by ex-meridian
  4. Longitude by meridian passage of the sun
  5. Longitude by chronometer
  6. Intercept
Latitude by Polaris (Pole Star)

As the Pole Star is always around the North Pole at radius of 1°, so it is always on or near the meridian passage. The latitude of the observer can be determined. The position line runs in an east-west, or nearly east-west, direction.

About the author

Manish Mayank

Graduated from M.E.R.I. (Mumbai). A cool, calm, composed and the brain behind the development of the database. The strong will to contribute in maritime education and to present it in completely different and innovative way is his source of inspiration.

2 Comments

Leave a Comment