11 Questions
What is the altitude called after applying the Dip and index error?
Apparent altitude
Where can data about the direction and velocity of rotary tidal currents be found?
Tidal Current Tables
What is the first action to take if you notice your vessel's course changing to the right when the gyro-pilot is engaged?
Switch to hand steering
What is used on an echo sounder to draw a line on paper to mark a specific time of an occurrence?
Event marker
In vessel navigation, what is the position obtained by applying only your vessel's course and speed to a known position?
Dead-reckoning
What does the compass rose on a nautical chart indicate in addition to variation?
Compass error
When the water salinity increases, what happens to the speed of sound?
It increases
What is the position obtained by applying estimated current and wind to your vessel's course and speed?
Dead-reckoning position
What type of projection is a Mercator Chart?
Cylindrical projection
In the IALA Buoyage System, what is the color of an East Cardinal Mark?
Black band above and below yellow band
Which publication contains ocean current information for voyage planning from Tokyo to San Francisco?
Sailing Directions
Study Notes
Navigational Concepts
- Altitude obtained after applying Dip and index error is called the True Altitude.
Tidal Currents
- Data about direction and velocity of rotary tidal currents can be found in Tidal Current Tables.
Gyro-Pilot Engagement
- If the vessel's course changes to the right when the gyro-pilot is engaged, the first action to take is to check the gyrocompass for proper operation and alignment.
Echo Sounder
- A stylus is used on an echo sounder to draw a line on paper to mark a specific time of an occurrence.
Vessel Navigation
- The position obtained by applying only the vessel's course and speed to a known position is called the Dead Reckoning Position.
- The position obtained by applying estimated current and wind to the vessel's course and speed is called the Estimated Position.
Nautical Charts
- The compass rose on a nautical chart indicates variation and magnetic bearings.
- A Mercator Chart is a type of cylindrical projection.
Buoyage System
- In the IALA Buoyage System, an East Cardinal Mark is colored black and yellow.
Ocean Currents
- Ocean current information for voyage planning from Tokyo to San Francisco can be found in Pilot Charts.
Test your knowledge on navigation concepts with this quiz. Questions cover topics like dead reckoning, tidal currents, zone descriptions, and more.
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