Electronic Navigation Flashcards
A vessel is required to use ALL available means to determine whether risk of collision exists!
True
False
True
A ____________ fix is possible with a reliable depth reading.
Double bearing
Single bearing
Definite
Accurate
Single bearing
_______________ and _______________ send and receive sound waves to determine depth.
Port and starboard
Hull and transducers
Transducers and transponders
Transducers and transceivers
Transducers and Transponders
Depth alarms can determine __________________.
Shallow water alarms
Deep water alarms
Specific depth alarms
All of the above
All of the above
__________________ may return a double echo.
Hard bottom
Soft mud bottom
Clay bottoms
Sandy bottoms
Soft mud bottom
What is the best definition which explains radar?
A transducer which sends out a signal to the ocean bottom and is then received a transponder.
A satellite receiving a signal of 406MHz which is then sent to the transponder on your vessel.
A high frequency electronic pulse which is sent from an antenna and bounced back to your vessel.
A unit which identifies a signal which is a series dotted lines and dashes which signifies a marine urgent message.
A high frequency electronic pulse which is sent from an antenna and bounced back to your vessel.
A properly tuned radar always shows all traffic in the immediate area of navigation.
True
False
False
“PPI” stands for ________________.
Personal Proprietary Indicator
Plan Position Indicator
Planned Personal Influence
Personal Placement Indication
Plan Position Indicator
Any object detected in your vicinity is known as a _________________.
Range
Relative motion
Target
Fix
Target
Radar terms may include __________________.
Variable range marker
Electric bearing line
Target
All of the above
All of the above
“Constant bearing, decreasing range” can determine ________________.
Opening distance
Risk of collision
Large CPA (Closest Point of Approach)
A small course change is necessary
Risk of collision
What element must be accounted for when using radar?
Rain
Crew training
Luminous range
Bottom contour
Rain
A GPS needs how many signals for a fix .
1
2
3
4
3
Commercial GPS units are accurate to _____________
225 ft
328 ft
500 ft
600 ft
328 ft // 100 Meters
North American Datum (NAD-1983) is the only datum that can be used with a GPS receiver.
True
False
False
