Nav Final CGA questions with answers

Nav Final CGA questions with answers

Degrees=Minutes=Nautical |miles |- |correct |answers✔✔1 |degree=60 |mins=60 |NM



The |shape |of |Earth |can |be |describe |as...? |- |correct |answers✔✔Oblate |Spheroid,
|Ellipsoid, |or |Geoid




Lines |of |Longitude |- |correct |answers✔✔-also |known |as |meridians

-converge |at |the |poles
-well |know |line |of |Longitude: |Prime |meridian



Minutes=Nautical |Miles=Yards |- |correct |answers✔✔1 |min=1 |NM=2000 |yds



What |are |the |two |different |types |of |chart |projections? |- |correct |answers✔✔Mercator
|and |Gnomonic




Parallels |are |always |equidistant |from |each |other |in |contrast |to |meridians |which
|converge |and |meet |at |the |poles.(T/F) |- |correct |answers✔✔True




What |is |the |practical |objection |to |following |a |great |circle |route?
a. |Nothing, |great |circles |are |the |shortest |distance |between |points.
b. |It |always |leads |to |the |North |pole.
c. |The |ship's |course |is |subject |to |continuous |alterations.

d. |The |ship |is |forced |to |complete |a |loxodromic |spiral. |- |correct |answers✔✔c. |The
|ship's |course |is |subject |to |continuous |alterations.




In |comparison |to |Rhumb |lines, |a |Great |Circle |route |is?
a. |equal
b. |longer

,c. |shorter |- |correct |answers✔✔c. |shorter



Distance |and |direction |cannot |easily |be |determined |using |a |gnomonic |chart.(T/F) |-
|correct |answers✔✔True




Are |not |equal |distance |from |one |another, |therefore |converge |and |ultimately |meet |at
|the |poles.



a. |Parallels

b. |Meridians |- |correct |answers✔✔b. |Meridians



Good |Radar |NAVAIDS |- |correct |answers✔✔-not |inland

-prominent |points |of |lands |or |islands
-visible |for |extended |track |of |time
-NO |BUOYS



Telescopic |alidade |- |correct |answers✔✔A |magnifying |viewing |device. |Allows |a |user |to
|simultaneously |observe |an |object |and |its |bearing |on |the |gyro |repeater.




The |telescopic |alidade |provides |what |type |of |information?
A. |Bearing
B. |the |Height
C. |The |Distance

D. |The |Weight |- |correct |answers✔✔A. |Bearing



NOAA |- |correct |answers✔✔-National |Oceanic |and |Atmospheric |Administration



US |Chart |#1 |- |correct |answers✔✔the |definitive |collection |of |all |symbols |used |on
|charts




Chart |scale |- |correct |answers✔✔the |ratio |of |the |size |of |the |chart |compared |to |the
|actual |size |of |the |area |on |the |chart

,Large |chart |scale(ex: |1:10,000) |- |correct |answers✔✔Shows |smaller |area |in |greater
|detail




Small |chart |scale(ex: |1:80,000) |- |correct |answers✔✔Shows |larger |area |in |less |detail



Datum |- |correct |answers✔✔a |plane |of |reference |which |all |depths, |heights, |and
|projections |on |a |chart |are |based




Charted |height |- |correct |answers✔✔Mean |High |Water(MHW)



Charted |depth |- |correct |answers✔✔Mean |Lower |Low |Water(MLLW)



Datum |shift |- |correct |answers✔✔Occurs |when |a |navigation |system |provides |a |fix
|based |on |a |datum |different |from |that |used |for |the |nautical |chart




navigational |draft |- |correct |answers✔✔the |depth |of |the |ship`s |keel |below |the |water
|line |when |loaded |plus |a |safety |zone |prescribed |by |the |Commanding |Officer




Shoal |water |- |correct |answers✔✔A |hazard |to |navigation |and |any |sounding |of |less
|than |the |prescribed |navigational |draft




course |- |correct |answers✔✔the |direction |a |vessel |travels |through |the |water



Heading |- |correct |answers✔✔the |direction |in |which |a |ship |points |at |any |moment
|and |is |instantly |changing




Track |- |correct |answers✔✔the |intended |horizontal |direction |of |travel |with |respect |to
|the |earth

, Speed |of |Advance |- |correct |answers✔✔the |speed |intended |to |be |made |good |when
|planning |a |voyage



or
the |average |speed |that |must |be |maintained |during |a |voyage |to |arrive |at |a
|destination |at |a |certain |time




3 |minute |rule |- |correct |answers✔✔distance |in |yards |traveled |in |3 |minutes |is |equal
|to |speed |in |knots |x |100




RADAR |operates |on |the |basis |of |microwave |energy |reflecting |off |objects |and
|returning.(T/F) |- |correct |answers✔✔True




What |is |the |Portfolio |Assignment |for |Chart |18AHA18773?
a. |18
b. |18A
c. |18773

d. |A |- |correct |answers✔✔d. |A



Large |Scale |Charts |show |more |detail |and |small |area.(T/F) |- |correct |answers✔✔True



What |reference |is |used |in |determining |depths |& |heights |on |a |nautical |chart?
a. |Distance |Scale
b. |Compass |Rose
c. |Sounding |Datum

d. |Latitude |- |correct |answers✔✔c. |Sounding |Datum



The |outer |ring |of |the |compass |rose |is |aligned |with?
a. |True |North
b. |Relative |North
c. |True |South