Doppler Log Principle
PRINCIPLE Doppler log is based on the principle of “Doppler Shift Effect”, i.e., apparent change in frequency received (from what was...
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Marine Teacher
Jun 23, 20205 min read
How to Keep a Navigational Watch?
ON ALL SHIP TYPES: 1. Compare compasses soon after taking-over watch. Autopilots usually have a "Magnetic Compass Off Course Alarm"....
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Marine Teacher
Jun 23, 20201 min read
How to Test of autopilot in the manual mode?
Testing of autopilot in the manual mode: The reason for this: The autopilot normally uses very minor angles of the helm while maintaining...
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Marine Teacher
Jun 23, 20201 min read
How to Test Magnetic off course alarm?
Magnetic off course alarm The gyrocompass may sometimes wander. This could be caused by faults in the system or by...
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Marine Teacher
Jun 1, 20201 min read
What is Pseudo AIS and Virtual AIS
VTS centers may send information about vessels which are not carrying AIS and which are tracked only by VTS radar, via the AIS to vessels...
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