F1 - 1090107 Determine position and accuracy

C-2

Sea clutter

In heavy weather, what operational control of a RADAR would you choose if you wish to eliminate unwanted echoes?

The distance run is multiply by 1.0

In a special case in navigation, with bearings relative to the ship’s heading, if you employ the method of doubling the angle, how could you find the distance off at the 2nd bearing?

Own ship’s marker

If you set your RADAR on a true motion display, which of the following will appear to move across the PPI scope?

Polaris

If you are on the northern hemisphere, What is the name of the so called pole star?

Flashes at regular intervals at a frequency of 120 flashes or more per minute

A flashing light is a light that __________.

A coded signal appearing on the same bearing at a greater range than the light.

If you are approaching a light fitted with a RACON, how could you identified the light on the radar?

58° 40.6’

If the observed sextant altitude of star Alkaid was 31’ 22.2’, index error 2.0’ off the arc, dip is 3.0’ and refraction 1.6’ what is the zenith distance of star Alkaid?

I would pass on the south side of the mark

How would you pass a buoy showing a quick white light and shows six (6) flashes and then one long flashing light?

Hard iron

Permanent magnetism is found in __________.

Never rely on a floating aid to maintain vessel’s position

How would you ensure that the vessel is always in safe water when traveling through a buoyed channel?

Accumulated rate

How would you classify the total amount of time which the chromometer has last gained since the date of the given error?

It is called the Line of equinoxes

How would you classify the line connecting Vernal equinox to autumnal equinox?

Observational twilight

How would you classify the solving of twilight time as a matter of preparation in star sight may it be evening or morning where the sun is 10 degree below the horizon?

Starting with a dash and extending radially outward from the target

How would the signal appear on the PPI display of a radar scream, if you are scanning a buoy fitted with a racon?

After the contact has been marked at least twice

How could you determine a closest point of approach (CPA) of a contact on a relative motion radar?

41° 09.8’

Find the true altitude of star Dubhe, if the sextant altitude being 41 - 17.2, index error 1.8’. Off the arc, dip correction 8.1’ and refraction 1.1’?

Polyconic

Which chart projection would be most suitable for marine surveying?

Easterly courses in high latitudes

At what distance does the great circle track provide maximum saving?

5° 30.0’N

At the time of meridian passage the navigator observe the sun bearing north. What is the navigator latitude, if the sun’s declination is 23° N and the observe corrected altitude is 72° 39’?

Eastern

At the evening twilight, the first star that should be observed are those with an azimuth in what quadrant?