Tactical navigation is directly concerned with maneuvering the ship in navigable waters.
Estimating ship’s position between known navigational points or fixes is known as
Radio navigation consists of which of the following categories?
1. Sub-space systems (SATNAV, TRANSIT, NAVSTAR) 2. Space–based systems (omega, loran)
One of the characteristics of dead reckoning is that the accuracy of the estimated position never exceeds the navigation method used to obtain the last fix. What happens to the accuracy of the estimated position over time?
Referring to landmarks with known positions on earth describes which one of the following navigation methods?
Which of the following actions required to determine position in piloting is/are not required in electronic navigation?
Seeing the landmarks
According to the 1992 Federal Radio Navigation Plan, which of the following systems will become the primary reference navigation system for surface ships?
what is LORAN
Long Range Aid to NAvigation
What is omega
VLF radio NAvigation
LORAN takes advantage of what radio signal characteristic?
OMEGA is a hyperbolic phase— difference measuring system that compares the phase angle of two or more radio signals synchronized to what device or factor?
A common time base
Which navigation system continually computes the latitude and longitude of a ship by sensing acceleration?
SINS (Ships inertial navigation system)
A ship’s inertial navigation system is dependent on celestial, sight, and radio navigation aids.
What device measures changes in speed or direction along the axis in which it lies?
What type of system is used to keep a SINS platform stabilized?
Which of the following is a standalone SINS?
Approximately how often can operators using the NNSS obtain fixes?
Every 2 hours
NNSS satellites transmit phase modulated data every 2 minutes on how many rf carriers?
What are the two types of NNSS satellite parameters included in the phase-modulated data?
Fixed and variable
The nominal orbit of NNSS satellites is what type of orbital parameter?
NNSS satellite data can be used as an accurate time reference.
NNSS satellite refined orbits are calculated at which of the following facilities?
Which of the following facilities calculates NNSS satellite clock error before satellite message injection?
Approximately how long does it take the injection station to transmit information to an NNSS satellite?
If errors are detected during a readback of freshly injected satellite data, how often is NNSS satellite message injection repeated until the transmission is verified as being correct?
every 2 minutes
At what point during the satellite pass will expansion effects cause the received frequencies to drop below the generated frequencies?
T3- Leaving away from
At what point will the received frequencies exactly match the transmitted frequencies?
At what point will compression effects cause the received frequencies to be higher than the transmitted frequencies?
T1- Approaching Fast
Which of the following factors affects the measurement of Doppler shift?