NAV Standard Flashcards
Who must be designated by the OIC to be the Nav PO?
1-1
an experienced coxswain who has the navigational proficiency in electronic navigation systems, nautical charts, and manual plotting methods
When must a OIC promulgate NAV Standards?
1-1
90 days
What are the two modes of primary navigation?
2-1
Automated and manual plotting
What is seaman’s eye?
2-1
Seaman’s eye is defined as navigation based on an extensive knowledge of the local area to include aids to navigation, terrestrial landmarks, and depth contours. Seaman’s eye, coupled with all other available navigational tools, can be used by Coast Guard boat coxswains as a primary method of boat navigation and to maintain the situational awareness of the boat’s position. For cutters, seaman’s eye can correlate what is being displayed on electronic navigation systems with what is being observed visually.
What is the difference between vector and raster charts?
2-2
raster chart are a digital image of a paper chart and do not posses “layered” data
What is classified as a electronic fix?
2-4
- Lat and Long provided by a GPS
- three or more LOPs taken with a radar or combination of radar and visual LOPs simultaneously
What is a running fix?
2-5
Used when limited objects are available for taking LOPs and the vessel remains on a consistent course. This type of fix advances or retires a LOP taken to the same object at two different times to fix the vessel’s position
What is a visual fix?
2-4
The common intersection of three or more lines of position at a common point obtained from simultaneous observations. (Lines of position from celestial bodies, if properly advanced from the time of observation, may also be included, despite not being simultaneous
What are the 6 rules for dead reckoning?
2-6
- Plot a new DR position at least every hour on the hour.
- Plot a new DR position at every course change.
- Plot a new DR position at every speed change.
- Plot a new DR position after each fix or running fix.
- Plot a new DR position when obtaining a single line of position.
- Plot a new course line from each fix or running fix.
What is ‘Verifying a vessel position”?
2-5
Radar/chart matching involves verifying the vessel’s position with the installed eNav system and the radar to match features that appear on both (e.g. Radar overlay feature on eNav System). The use of a fathometer to match observed depth with charted depth is also a means of verification.
What is the definition of Nav Draft and who determines it?
2-7
Navigational Draft is defined as a depth of water that serves as the threshold for safe operations, as determined be the CO/OIC
What is considered a corrected electronic chart?
4-6
a. An electronic chart is considered currently corrected if it has been corrected within the last six months. b. The Coast Guard has contracted to provide updated electronic charts for SINS equipped boats every six months. In the event that SINS electronic charts are out of date (longer than six months old) CO/OICs may authorize use of SINS as primary means of navigation if a currently corrected paper chart is onboard.
When do you determine set and drift?
4-7
a. If fix interval is three minutes or greater, determine set and drift with every fix.
b. If the fix interval is less than three minutes, determine set and drift with every second fix.
c. If there is no fix, consider set and drift as part of determining an estimated position (EP).
Where do you find the requirements for a station’s Nav Standard?
5-1
Chapter 5 of the Nav Standards
What are 4 Nav standard responsibilities for all UNIT OICs?
1-1
- Ensure compliance with the provisions of this Manual.
- Promulgate Command Navigation Standards within 90 days of assuming command.
- Assign, train, and certify navigation personnel in accordance with References (a) through (h), as appropriate.
- Incorporate the principles of effective risk management into navigational planning
