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Questions and Answers
What is the altitude called after applying the Dip and index error?
What is the altitude called after applying the Dip and index error?
- Sextant altitude
- Apparent altitude (correct)
- Observed Altitude
- Computed altitude
Where can data about the direction and velocity of rotary tidal currents be found?
Where can data about the direction and velocity of rotary tidal currents be found?
- Tide Tables
- Nautical Almanac
- Mariner's Guide
- Tidal Current Tables (correct)
What is the first action to take if you notice your vessel's course changing to the right when the gyro-pilot is engaged?
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 (correct)
- Call the Master
- Notify the engineroom
- Shift steering to the emergency steering station
What is used on an echo sounder to draw a line on paper to mark a specific time of an occurrence?
What is used on an echo sounder to draw a line on paper to mark a specific time of an occurrence?
In vessel navigation, what is the position obtained by applying only your vessel's course and speed to a known position?
In vessel navigation, what is the position obtained by applying only your vessel's course and speed to a known position?
What does the compass rose on a nautical chart indicate in addition to variation?
What does the compass rose on a nautical chart indicate in addition to variation?
When the water salinity increases, what happens to the speed of sound?
When the water salinity increases, what happens to the speed of sound?
What is the position obtained by applying estimated current and wind to your vessel's course and speed?
What is the position obtained by applying estimated current and wind to your vessel's course and speed?
What type of projection is a Mercator Chart?
What type of projection is a Mercator Chart?
In the IALA Buoyage System, what is the color of an East Cardinal Mark?
In the IALA Buoyage System, what is the color of an East Cardinal Mark?
Which publication contains ocean current information for voyage planning from Tokyo to San Francisco?
Which publication contains ocean current information for voyage planning from Tokyo to San Francisco?
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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.
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