OUPV -6 Pack Practice Questions and
All Accurate Answers 2026/2027
Update.
1 Part per million is oil pollution - Answer
Low Pressure - Answer Air rises near low pressure areas. As air rises, it cools and often
condenses
What is piloting? - Answer Piloting is the movement of a vessel by referring to landmarks,
aids to navigation, depth sounding and radio navigation.
What is dead reckoning? - Answer The process of navigating by advancing a known position
using course, speed, time and distance to be traveled. In other words, figuring out where you
will be at a certain time if you hold speed, time and course you plan to travel.
DR Plot (Dead reckoning plot) - Answer A DR plot should be maintained at all times. It is the
best estimate of where the vessel should be at any given time.
Latitude and Longitude - Answer Marine navigation is based on a system of geographic
coordinates that are used to describe a specific location on a body of water. The best known
system and most widely used set of coordinates is latitude and longitude system.
Nautical mile - Answer equals approximately 2000 yards or 1.15 statute miles.
Distance on nautical charts is measured by? - Answer We use ONLY latitude to measure
distance on nautical charts.
True North - Answer Is different from magnetic north. The difference between them is called
Variation.
Mercator projection - Answer The type of projection most widely used in coastal navigation.
1 Min of latitude is equal to 1 mile everywhere - Answer LATITUDE SCALE ONLY that is used
for measuring distance.
Compass card - Answer Remains stationary and the vessel turns around the compass card.
,Lubber Line - Answer The Lubber's line is a line or mark scribed on the compass card housing
to indicate the direction in which the boat is heading.
Variation - Answer The difference between true north and magnetic north.
On nautical charts, the variation for a given area is noted at the center of the compass Rose. -
Answer
What is Deviation? - Answer The compass error caused by magnetic forces within the vessel,
such as electronic equipment and ferrous metal objects.
The sum of variation and deviation are called? - Answer Compass error
National Ocean Service - Answer Part of NOAA and responsible for preparing nautical charts
Mercator Chart - Answer Mercator chart projection is the most widely used projection is
marine navigation.
Small scale-Large Scale - Answer Small scale charts show a large area. Large scale chart shows
a small area.
All heights given in feet above mean high water unless otherwise stated. - Answer
Vertical roman lettering used to table all conspicuous information that is not affected by the
tidal changes or current. - Answer
A dotted line around any symbol calls special attention to its hazardous nature. - Answer
Coast Guards local notice to mariners - Answer Charts are corrected using information
provided in the Coast Guard's local notice to mariners. They are published weekly by geographic
region.
Mariners are first warned by a marine broadcast local notice to mariners. - Answer
The dead reckoning (DR) track is the path or course the vessel is expected to follow. It is plotted
from a known position using courses and speeds through water. - Answer
, USCG light list - Answer Published in seven volumes and contains lights and other aids to
navigation. This publication and the data contained within it is maintained and published by the
coast guard.
The National Ocean Service (NOS) - Answer Is part of NOAA and is responsible for surveying
the coast, harbors, and tidal estuaries of the U.S. and it's possessions. One of their publications
is the Coast Pilot.
The 3R Rule - Answer This means that when entering from seaward, keep the red aids to
starboard (right) side and green aids to port (left) side. In addition, each aid is numbered, and
these numbers increase as entering from seaward.
Safe Water Marks - Answer These aids are used to mark fairways, mid-channels, and offshore
approach points and have unobstructed water on all sides.
Ranges - Answer A range is a PAIR of aids to navigation, which when lined up with each other,
mark a channel center line.
Special Marks - Answer Some areas that may be marked by these aids to navigation are spoil
areas, pipelines, traffic separation schemes, jetties, or military exercise areas. Yellow lights and
exhibit a flashing or fixed rhythm.
Information & Regulatory marks - Answer Are used to alert the mariner to various warnings
or regulatory matters. They have orange geometric shapes against a white background.
BUOY POSITION - Answer Buoy positions represented on nautical charts are approximate
positions only. NEVER RELY on buoys alone to determine position.
Most aids to navigation are fitted with retro reflective material to increase their visibility in
darkness. - Answer
Preferred channel Marks - Answer exhibit a composite group-flashing light rhythm of two
flashes followed by a single flash.
For situations where lights require a distinct cautionary significance, as at sharp turns, sudden
channel constrictions, wrecks or obstructions, a quick flashing light rhythm is used. - Answer
All solid red and solid green aids to navigation are numbered. Reds have even numbers and
green have odd numbers. The numbers increase from seaward. - Answer
All Accurate Answers 2026/2027
Update.
1 Part per million is oil pollution - Answer
Low Pressure - Answer Air rises near low pressure areas. As air rises, it cools and often
condenses
What is piloting? - Answer Piloting is the movement of a vessel by referring to landmarks,
aids to navigation, depth sounding and radio navigation.
What is dead reckoning? - Answer The process of navigating by advancing a known position
using course, speed, time and distance to be traveled. In other words, figuring out where you
will be at a certain time if you hold speed, time and course you plan to travel.
DR Plot (Dead reckoning plot) - Answer A DR plot should be maintained at all times. It is the
best estimate of where the vessel should be at any given time.
Latitude and Longitude - Answer Marine navigation is based on a system of geographic
coordinates that are used to describe a specific location on a body of water. The best known
system and most widely used set of coordinates is latitude and longitude system.
Nautical mile - Answer equals approximately 2000 yards or 1.15 statute miles.
Distance on nautical charts is measured by? - Answer We use ONLY latitude to measure
distance on nautical charts.
True North - Answer Is different from magnetic north. The difference between them is called
Variation.
Mercator projection - Answer The type of projection most widely used in coastal navigation.
1 Min of latitude is equal to 1 mile everywhere - Answer LATITUDE SCALE ONLY that is used
for measuring distance.
Compass card - Answer Remains stationary and the vessel turns around the compass card.
,Lubber Line - Answer The Lubber's line is a line or mark scribed on the compass card housing
to indicate the direction in which the boat is heading.
Variation - Answer The difference between true north and magnetic north.
On nautical charts, the variation for a given area is noted at the center of the compass Rose. -
Answer
What is Deviation? - Answer The compass error caused by magnetic forces within the vessel,
such as electronic equipment and ferrous metal objects.
The sum of variation and deviation are called? - Answer Compass error
National Ocean Service - Answer Part of NOAA and responsible for preparing nautical charts
Mercator Chart - Answer Mercator chart projection is the most widely used projection is
marine navigation.
Small scale-Large Scale - Answer Small scale charts show a large area. Large scale chart shows
a small area.
All heights given in feet above mean high water unless otherwise stated. - Answer
Vertical roman lettering used to table all conspicuous information that is not affected by the
tidal changes or current. - Answer
A dotted line around any symbol calls special attention to its hazardous nature. - Answer
Coast Guards local notice to mariners - Answer Charts are corrected using information
provided in the Coast Guard's local notice to mariners. They are published weekly by geographic
region.
Mariners are first warned by a marine broadcast local notice to mariners. - Answer
The dead reckoning (DR) track is the path or course the vessel is expected to follow. It is plotted
from a known position using courses and speeds through water. - Answer
, USCG light list - Answer Published in seven volumes and contains lights and other aids to
navigation. This publication and the data contained within it is maintained and published by the
coast guard.
The National Ocean Service (NOS) - Answer Is part of NOAA and is responsible for surveying
the coast, harbors, and tidal estuaries of the U.S. and it's possessions. One of their publications
is the Coast Pilot.
The 3R Rule - Answer This means that when entering from seaward, keep the red aids to
starboard (right) side and green aids to port (left) side. In addition, each aid is numbered, and
these numbers increase as entering from seaward.
Safe Water Marks - Answer These aids are used to mark fairways, mid-channels, and offshore
approach points and have unobstructed water on all sides.
Ranges - Answer A range is a PAIR of aids to navigation, which when lined up with each other,
mark a channel center line.
Special Marks - Answer Some areas that may be marked by these aids to navigation are spoil
areas, pipelines, traffic separation schemes, jetties, or military exercise areas. Yellow lights and
exhibit a flashing or fixed rhythm.
Information & Regulatory marks - Answer Are used to alert the mariner to various warnings
or regulatory matters. They have orange geometric shapes against a white background.
BUOY POSITION - Answer Buoy positions represented on nautical charts are approximate
positions only. NEVER RELY on buoys alone to determine position.
Most aids to navigation are fitted with retro reflective material to increase their visibility in
darkness. - Answer
Preferred channel Marks - Answer exhibit a composite group-flashing light rhythm of two
flashes followed by a single flash.
For situations where lights require a distinct cautionary significance, as at sharp turns, sudden
channel constrictions, wrecks or obstructions, a quick flashing light rhythm is used. - Answer
All solid red and solid green aids to navigation are numbered. Reds have even numbers and
green have odd numbers. The numbers increase from seaward. - Answer
