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Pelorus
North-seeking gyro is a gyro with damped precession such that it will align itself parallel to the Earth's spin axis.SPT North-seeking GyroTracer incorporates the very latest technological advances, which makes it the best gyroscopic surveying instrument for the mining and Oil & Gas industries that need to ensure repeatable fast, reliable and precise downhole survey data as well as time saving and the highest return on investment.SPT north seeking gyro is highly accurate, extremely reliable downhole directional survey and orientation tool that uses gyro compassing method to determine direction.
compass
If you mean the difference between a compass and a compass rose: The compass is the complete instrument. The compass rose is the degree wheel printed under the needle.
Elmer Ambrose Sperry was the inventor of the gyro compass and gyroscope.
For synchronising the magnetic and gyro compass elements For synchronising the magnetic and gyro compass elements
Rather than type a long answer - see the related link from Wikipedia for their entry on a gyro-compass.
Apps can use the compass to determine the phone's current direction. This is useful for maps applications, GPS, or anything else that might need to know the current direction.
Most notably, the gyro compass.
The disadvantages of using a compass for surveying is that readings are often inaccurate (accuracy dependent on size and graduations of compass, it is easily disturbed by effects of local magnetic attraction
its getting to ship , wiring of the line of tube
Pelorus
Advantages: theres a bacteria that you actually need to help you disadvantages: theres others that can hurt you
There are 60 minutes in 1 degree.
The term Gyro refers to any Gyroscope (Space,Earth,Tied or Rate) whereas Directional Gyro is typically a Tied Gyro which is used in Aircraft for the purpose of Heading reference in DGI (Directional Gyro indicator) because it does not suffer any errors like magnetic compass.
A magnetic compass uses the poles of our planet to stay in alignment. A Gyroscopic compass is set to a particular direction and tends to try to stay that way. After time, even the best Gyro will start to precess (move). This means the you will need to compare your Gyro to the magnetic every 15 minutes or so. Some modern gyroscopic compasses are capable of auto resetting to do this update automatically