OUPV Navigation General study
Guide 2025 Questions and Answers
"Slack Water" During a tidal change means - ✔✔Little or no movement of water
When entering a channel from the sea and decide to check your compass heading you
steer on a pair of range lights and find the upper light is in line with the lower light,
You should - ✔✔Maintain your current course
You observe a buoy mark having Green and Red horizontal bands it will have a light
characteristic of - ✔✔Composite group flashing (2+1)
The direction of the earth's surface wind is - ✔✔Deflected by the earth's rotation
(Coriolis Effect)
Your vessel's position should be plotted using the bearing of - ✔✔Fixed known objects
on shore
Which buoy may be lettered and NOT numbered - ✔✔Preferred Channel Buoy
Spring tides will produce - ✔✔Higher highs and lower lows
You must assume when using a buoy as an aid to navigation - ✔✔The buoy may not be
in the charted position
The "Local Notice to Mariners" provides corrections of local nature to charts and is
published how often - ✔✔Weekly
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
, Term "Tide" - ✔✔Vertical movement of the water
When plotting a voyage, You should - ✔✔Never rely on floating buoy to maintain its
exact position
The difference of height between low and high tide is referred to as the - ✔✔Range of
tide
From seaward the IALA Region B red and green horizontally banded buoys refer to -
✔✔Preferred Channels
determining the height of land features on most charts unless otherwise stated the
"Reference datum" is - ✔✔Mean High water
Red or Green lights may appear on - ✔✔Horizontally Banded Buoys
The depth of the water on a chart is the - ✔✔Vertical distance from the chart sounding
datum to the ocean bottom
North Hemisphere wind which shifts in a counter clockwise motion is called -
✔✔Backing wind
A vessel's position acquired by using at least three or more bearings are called a -
✔✔Fix
Mean lower low water (MILLW) is the reference plane used for - ✔✔Sounding on the
U.S East and West coast
a single line of position combined with a dead reckoning position results in a -
✔✔Estimated position
The sun and moon alight twice each month what type of tides can be expected -
✔✔Spring
A buoy mark with composite group flashing light indicates a - ✔✔Preferred channel
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
Guide 2025 Questions and Answers
"Slack Water" During a tidal change means - ✔✔Little or no movement of water
When entering a channel from the sea and decide to check your compass heading you
steer on a pair of range lights and find the upper light is in line with the lower light,
You should - ✔✔Maintain your current course
You observe a buoy mark having Green and Red horizontal bands it will have a light
characteristic of - ✔✔Composite group flashing (2+1)
The direction of the earth's surface wind is - ✔✔Deflected by the earth's rotation
(Coriolis Effect)
Your vessel's position should be plotted using the bearing of - ✔✔Fixed known objects
on shore
Which buoy may be lettered and NOT numbered - ✔✔Preferred Channel Buoy
Spring tides will produce - ✔✔Higher highs and lower lows
You must assume when using a buoy as an aid to navigation - ✔✔The buoy may not be
in the charted position
The "Local Notice to Mariners" provides corrections of local nature to charts and is
published how often - ✔✔Weekly
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
, Term "Tide" - ✔✔Vertical movement of the water
When plotting a voyage, You should - ✔✔Never rely on floating buoy to maintain its
exact position
The difference of height between low and high tide is referred to as the - ✔✔Range of
tide
From seaward the IALA Region B red and green horizontally banded buoys refer to -
✔✔Preferred Channels
determining the height of land features on most charts unless otherwise stated the
"Reference datum" is - ✔✔Mean High water
Red or Green lights may appear on - ✔✔Horizontally Banded Buoys
The depth of the water on a chart is the - ✔✔Vertical distance from the chart sounding
datum to the ocean bottom
North Hemisphere wind which shifts in a counter clockwise motion is called -
✔✔Backing wind
A vessel's position acquired by using at least three or more bearings are called a -
✔✔Fix
Mean lower low water (MILLW) is the reference plane used for - ✔✔Sounding on the
U.S East and West coast
a single line of position combined with a dead reckoning position results in a -
✔✔Estimated position
The sun and moon alight twice each month what type of tides can be expected -
✔✔Spring
A buoy mark with composite group flashing light indicates a - ✔✔Preferred channel
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
