NAV 7 DIAGNOSTIC TEST

A coastal chart could have a scale of:

• 1:100,000

• 1:300,000

• 1:600,000

• 1:15,000

Answer explanation

Coastal Charts is 1:50,000 to 1:150,000

A Mercator chart is?

• Azimuthal Projection

• Gnomonic Projection

• Cylindrical Projection

• Conic Projection

The observer is at Equator and the celestial body is at the First Point of Capricorn, the bearing of the celestial body during meridian transit is:

• 0 degrees

• 180 degrees

• 23.5° South

• 23.5° North

Answer explanation

• The First Point of Capricorn has a declination of approximately 23.5° South.

• The observer is on the Equator, so:

  • If a celestial body has a southerly declination, it will culminate (meridian transit) to the South of the zenith.

  • Hence, at meridian passage, the body is due South of the observer.

Sun’s Position Below Horizon 6° to 12° is called?

• Civil Twilight

• Nautical Twilight

• Astronomical Twilight

• Opposite Twilight

The most reliable form of navigational system in the high seas, is?

• Radio Navigation

• Celestial Navigation

• Terrestrial Navigation

• Coastal Navigation

The horizontal direction of a point on the celestial sphere is called:

• Altitude

• Declination

• Azimuth

• Zenith

Which term refers to the direction a current is flowing?

• Course

• Bearing

• Set

• Drift

When the moon is new or full, which type of tides occur?

• Spring Tide

• Neap Tide

• Ebb Tide

• Flood Tide

Under IALA cardinal system, a mark with quick white light showing 3 flashes every 10 seconds indicates that the safest water in the area is on?

• North

• East

• South

• West

A GPS satellite transmits a signal through the first carrier on?

• 1381.05 MHz

• 1227.60 MHz

• 1176.45 MHz

• 1575. 42 MHz

Answer explanation

• GPS satellites transmit signals on multiple radio frequencies, known as L-band frequencies.

• The L1 frequency is the primary signal used by civilian GPS receivers.

L1 1575.42 MHz Civilian GPS (Coarse/Acquisition code – C/A code)

L2 1227.60 MHz Used for military (Precise code – P(Y) code) and dual-frequency receivers

L5 1176.45 MHz New civilian signal (more accurate, better integrity)

L3 1381.05 MHz Used for nuclear detonation detection (not GPS nav)