Dead Reckoning
Procedures
Procedures
What course and speed are used to construct the DR plot?
Your ordered/given course and speed
What are the two basic modes of ARPA?
Realitive 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
Define the following terms: CPA, BCR and BCT.
Closest point of approach
Bow crossing range
Bow crossing time
What is...
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
Where can you find Dead Reckoning Guildlines?
NAVDORM-3A
During ARPA initialization, ARPA settings default to what?
Last settings
What are the two methods of improving sea clutter suppression?
Automatic and Manual anti clutter control
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.
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 five 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