1–11. A  ship’s  inertial  navigation  system is dependent on celestial, sight, and radio navigation aids. 1. True 2. False 1–12. What  device  measures  changes  in speed or direction along the axis in which it lies? 1. Gyroscope 2. Accelerometer 3. Axilometer 4. Servoscope 1-13. What type of system is used to keep a  SINS  platform  stabilized? 1. Servo 2. Synchro 3. Gyro 4. Turbo 1–14. Which of the following is a stand- alone  SINS? 1. AN/WSN-5 2. AN/WSN–25 3. AN/WRN-6 4. AN/WRN-8 1-15. Approximately  how  often  can operators  using  the  NNSS  obtain fixes? 1. Every hour 2. Every 2 hours 3. Every 3 hours 4. Every 4 hours 1-16. NNSS  satellites  transmit  phase modulated  data  every  2  minutes  on how  many  rf  carriers? 1. One 2. Two 3. Three 4. Four 1–17. What are the two types of NNSS satellite  parameters  included  in the  phase-modulated  data? 1-18. The nominal orbit of NNSS satellites is what type of orbital parameter? 1. Status 2. Command 3. Systems 4. Fixed 1-19. NNSS satellite data can be used as an accurate time reference. 1. True 2. False 1-20. NNSS  satellite  refined  orbits  are calculated at which of the following   facilities? 1. Tracking  station 2. Control  station 3. Computer  center 4. Injection  station 1-21. Which  of  the  following  facilities calculates  NNSS  satellite  clock error  before  satellite  message injection? 1. Control  center 2. Computer  center 3. Tracking  station 4. Injection  station 1-22. Approximately how long does it take the  injection  station  to  transmit information  to  an  NNSS  satellite? 1. 10 seconds 2. 12 seconds 3. 15 seconds 4. 18  seconds l-23. 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? 1. Every 20 seconds 2. Every 2 minutes 3. Every 2 hours 4. Every 12 hours 1. Systems  and  command 2. Terrestrial  and  space 3. Status and update 4. Fixed and variable 2