OUPV Chart Plotting 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
What can interfere with a magnetic compass' function? - 🧠ANSWER
✔✔Electronics/magnetic devices (phone in cupholder, chart plotter installed
too close, etc)
Compass based on an indicator (as a magnetic needle) that points to the
magnetic north. - 🧠ANSWER ✔✔Magnetic Compass
Compass error. The angular difference between the true meridian
(unchanging) and magnetic meridian (which shifts and curves due to
magnetic anomalies in the earth's crust and the misalignment of the
magnetic and true north poles. This varies by location and by year, but not
change on heading; always use the nearest compass rose on a chart
, (expressed in red as West/East of true north) - 🧠ANSWER ✔✔Compass
Variation
Compass error, caused by the presence of metal objects near the
compass, or by the iron in boat or vessel itself, pulling the indicator slightly
away from magnetic north. This varies by the vessel itself, and the direction
the vessel is facing: if the metal objects are aligned with magnetic north,
pulling the indicator in the same direction, then this will be 0. This can be
compensated for but never eliminated. A vessel should have a table for
this, with the amount of this given for every 15 degrees or so (expressed as
East/West). - 🧠ANSWER ✔✔Compass Deviation
The key formula to translating between different compass bearings,
showing the relationship that deviation and variation have with magnetic,
true, and ship's compass readings. (Done backwards: sober subtraction). -
🧠ANSWER ✔✔True Virgins Make Dull Companions, Add Whiskey
Where is 360 degrees? - 🧠ANSWER ✔✔THIS DOESN'T EXIST. IT'S 000
This bearing is based on the ship's longitudinal axis: bow is 000, STB beam
is 90, etc. - 🧠ANSWER ✔✔Relative (R)
Questions and Verified Answers |
Already Graded A+
What can interfere with a magnetic compass' function? - 🧠ANSWER
✔✔Electronics/magnetic devices (phone in cupholder, chart plotter installed
too close, etc)
Compass based on an indicator (as a magnetic needle) that points to the
magnetic north. - 🧠ANSWER ✔✔Magnetic Compass
Compass error. The angular difference between the true meridian
(unchanging) and magnetic meridian (which shifts and curves due to
magnetic anomalies in the earth's crust and the misalignment of the
magnetic and true north poles. This varies by location and by year, but not
change on heading; always use the nearest compass rose on a chart
, (expressed in red as West/East of true north) - 🧠ANSWER ✔✔Compass
Variation
Compass error, caused by the presence of metal objects near the
compass, or by the iron in boat or vessel itself, pulling the indicator slightly
away from magnetic north. This varies by the vessel itself, and the direction
the vessel is facing: if the metal objects are aligned with magnetic north,
pulling the indicator in the same direction, then this will be 0. This can be
compensated for but never eliminated. A vessel should have a table for
this, with the amount of this given for every 15 degrees or so (expressed as
East/West). - 🧠ANSWER ✔✔Compass Deviation
The key formula to translating between different compass bearings,
showing the relationship that deviation and variation have with magnetic,
true, and ship's compass readings. (Done backwards: sober subtraction). -
🧠ANSWER ✔✔True Virgins Make Dull Companions, Add Whiskey
Where is 360 degrees? - 🧠ANSWER ✔✔THIS DOESN'T EXIST. IT'S 000
This bearing is based on the ship's longitudinal axis: bow is 000, STB beam
is 90, etc. - 🧠ANSWER ✔✔Relative (R)
