Gyro-compass Speed Error.
Gyro-Compass Speed Error: an error of the gyro-compass; the gyroscope axis deviation from to the true north direction.
It depends on the vessel speed, the ship course and the latitude.
It is maximum in courses of 0 ° and 180 ° and null in courses of 90 ° and 270 °.
It can be removed automatically using a special corrector.
Gyro-compass Speed Error _ v1.0
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how to get 900
The rotational speed of the Earth in 1 hour is = 360⁰ / 24 hours = 15⁰ / hour
A point on the Earth’s Equator rotates with speed is = 15⁰ * 60’= 900′ / hour = 900 Nm / hour
It turns out that the rotational speed of a point on a parallel of some latitude, in [Nm / hour] is = 900 * cos Lat