Dead Reckoning
Procedures
Procedures
What course and speed are used to construct the DR plot?
Your ordered/given course and speed
What are the 2 basic modes of ARPA?
Relative and True motion
What control is used to adjust the sensitivity of the receiver, and thus the intensity of echoes as they appear on the screen?
Sensitivity Gain
Where can the List of Lights be used?
U.S. and U.S. territories
What does PIM stand for?
Plan of Intended Movement
How do you find each?
Distance =
Time =
Speed =
Distance = Speed x Time, (Speed x Time/60)
Time = Distance/Speed, (Distance x 60)/Speed
Speed = Distance/Time, (Distance/Time) x 60
What are 3 ARPA display features?
Navigation data
Target tracking vectors
On screen digital readouts
What function would you use to improve target detection during adverse weather conditions, clouds, rain or snow?
Precipitation Clutter Suppression
List 3 things you can find in the Coast Pilot?
Navigation Regulations
Local currents
Environmental Factors
Facility and Port Details
Define the following terms: CPA, BCR and BCT
Closest point of approach
Bow crossing range
Bow crossing time
Where can you find Dead Reckoning Guidelines?
NAVDORM-3A
During ARPA initialization, ARPA settings default to what?
Last settings
What are the 2 methods of improving sea clutter suppression?
Automatic and Manual Anti Clutter Control
What is the NGA PUB for both PACIFIC and ATLANTIC?
Atlantic Pub 140 and Pacific Pub 120
While underway in coastal waters, you notice the GPS is unavailable. What are 2 options for obtaining an accurate fix?
1. Visual fixes
2. Radar fixes
What is CDMVT|AE?
Compass
Deviation
Magnetic
Variation
True Head
Add
East
In the basic true motion mode, the presentation changes to what if the gyrocompass fails?
Head Up
Name 3 things that can cause an audible/visual alarm.
CPA/TCPA, Lost target, Guard rings, System failure, Target full situation
What info can you find in the Nautical Almanac?
Position of Celestial bodies to determine ships position
While sailing in restricted waters, the maximum fix interval is?
Every 3 minutes
Draw and label these plotting symbols:
Visual/Celestial Fix
Electronic/Composite Fix
Estimated Position
Dead Reckoning Position
Circle with dot in middle (Visual or Celestial Fix)
Triangle with dot in middle (Electronic or Composite Fix)
Square with dot in middle (Estimated Position)
Line with half circle and dot (Dead reckoning Position)
What are the 5 presentation modes of ARPA?
Head-up (HU)
Head-up True Bearing (HU/TB)
Course-up (CU)
North-up (NU)
True Motion (TM)
Where is Pulse Width Upper on the screen?
On the left position of the screen
What are the 5 types of Marine Navigation?
1. Dead Reckoning
2. Piloting
3. Celestial Navigation
4.Satellite Navigation
5. Radio Detection and Ranging Navigation
When constructing a PIM track, at what minimum interval are intermediate points plotted?
Every 4 hours at minimum