NAVDORM Flashcards
What are common adverse factors for navigation accuracy?
Accumulation of errors in information flow
Lack of proper emphasis on navigation accuracy
Improper determination of set and drift and DR
Improperly calibrated EM log and inaccurate or improper azimuth reference
Lack of user knowledge regarding GPS
Lack of awareness of the limitations and requirements of Electronic Chart Systems
Lack of compliance with navigational procedures
Not following CSOSS WRT navigation systems
Before entering a GPS denial area, what is the most significant action a warship can take?
Ensure all GPS receives have their crypto keyed and updated at regularly scheduled intervals
How often must Navigators administer RoR exams with 20 questions? To who?
Monthly
All qualified OODs, JOODs, CONNs, TAOs, CICWOs, SUWCs, ANAV, QMOW
How long must copies of RoR exams be maintained?
1 year
What happens if a watchstander scores below 90 percent?
NAV must remediate them within 7 days
Are we required to carry paper charts?
Yes.
What must be your primary fix source in all waters?
GPS
In restricted waters, how often must you compare a GPS fix to a secondary, independent source?
No greater than every 3rd fix interval
Who conducts a Navigation Assessment, and when?
ISIC, during READ E5 / coming out of the yards aka sea trials
The CO must ensure what is delineated in the NAVBILL?
Primary, secondary, and tertiary means of fixing ship’s position.
When must the Navigator report the ship’s position to the CO?
0800
1200
2000
Whose job is it to maintain the Ship’s Deck Log, Magnetic Compass Record, and weather observation sheets?
QMOW
List 10 watchstanders you must have on watch while in Restricted Waters.
OOD CONN Helm Lee Helm HSO QMOW Bearing Record Bearing Taker Lookouts Bridge/CIC Phone Talker
Who’s on the Plotting Team?
Shipping Officer
Piloting Officer
Navigation Recorder
SUWC
List the Position Source Precedence.
Open Ocean GPS; INS; Celestial
Coastal GPS; Visual, Radar, or Composite; INS; celestial
Piloting GPS; Visual, Radar, or Composite
Restricted GPS; Visual, Radar, or Composite
What restriction do you have whenever you shift to INS navigation?
INS may only be used for up to 8 hours when GPS is not updating INS. After 8 hours, celestial is more accurate than INS and will be used.
Can we utilize commercial GPS?
Only in emergencies after the failure of all GPS receivers
Recreate the Fix Accuracy and MAX Fix Interval table.
AREA Distance from land/shoal GPS FOM Max Fix Interval
Restricted < 2 NM FOM <= 2 3 min
Piloting 2 -10 NM FOM <= 4 3-15 mins as cond. warrant
Coastal 10 – 30 NM FOM <= 6 15-30 mins as cond. warrant
Open Ocean > 30 NM FOM <= 7 30 mins or as cond. warrant
Is “Restricted Waters” only defined by the above table?
No – it is also defined as any waters less thant eh ship’s Safety Depth
List the different Estimated Position Errors (meters) for each FOM
FOM Meters 1 <= 25 2 25 – 50 3 50 – 75 4 75 – 100 5 100 – 200 6 200 - 500 7 500 – 1000 8 1000 – 5000 9 5000m
What organization(s) can you request a foreign chart or foreign publication from?
USFF
CPF
How often should you determine gyrocompass/INS error?
Daily underway
Prior to any major evolution
How often must gyrocompass repeater error by updated?
Daily
When is a NAVBRIEF required?
Within 24 hours prior to entering port, restricted waters transits, before getting underway
Discuss signature sheets, including retention.
All brief audience and participants must sign a muster sheet.
CO must sign and approve the NAV BRIEF.
These sheets are maintained for 1 year onboard.
What is the only electronic tide and current programs the CO may authorize?
NOAA tides and currents
NOAA tides and current online for US Waters
How often is your navigator required to determine set and drift?
At least once on each leg less than 1500 yards
Every 3rd fix for legs greater than 1500 yards
Discuss the requirements for checklists for navigation evolutions.
Use is required
Maintain onboard for 1 year
How often should you calculate set and drift in open ocean?
Every hour
How often must you compare all fix sources (excl. celestial) and determine the ship’s position?
Hourly
What must be your primary navigation plot if undergoing a Dead-stick move?
ENL (Emergency Navigation Laptop)
