1–35. You  are  initializing  the  AN/SRN– 19(V)2. In  addition  to  programing the set’s position, what other parameter  must  you  enter? 1. Antenna  height 2. Ship’s  length 3. Usable  power 4. Cabling  length 1–36. What  navigational  system  will replace the NNSS? 1. NAVSTAR GPS 2. OMEGA MK2 3. LORAN D 4. NNSS MK2 1-37. Which  of  the  following  terms describe  GPS  satellite  positioning data? 1. Update  and  status 2. Variable  and  fixed 3. Daily and hourly 4. Almanac  and  ephemeris 1–38. How often is the GPS satellite navigation  data  message  updated? 1. Every hour 2. Every 12 hours 3. Every 24 hours 4. Every 36 hours 1–39. What  facility  transmits  the  data required to update the GPS satellite  navigation  data  message? 1. Manned  control  center 2. Manned  tracking  station 3. Unmanned  monitor  station 4. Unmanned  injection  station 1-40. There are how many (a) active spare and (b) active operational GPS satellites? 1. (a)  21  (b)  3 2. (a) 3  (b)  21 3. (a)  3  (b)  24 4. (a) 24 (b) 21 1–41. How many earth orbits will each GPS satellite complete in a 24–hour period? 1. One 2. Two 3. Three 4. Four 1–42. What  communications  technique  is used  for  GPS  satellite  broadcasts? 1. Spontaneous–emission 2. Spread–spectrum 3. Standard–broadcast 4. Spectral–emission 1–43. GPS satellites are positioned so a minimum  of  how  many  satellites  are observable to a user anywhere on earth? 1. One 2. Two 3. Three 4. Four 1–44. Which of the two codes (C/A and P) transmitted  by  GPS  satellites  is NOT  available  to  civilian  users? 1. Course  acquisition  code 2. Precise code 1–45. Which of the following data is NOT included in the GPS NAV–msg? 1. Clock–bias 2. Correction  data 3. Ephemeris 4. Spectral l-46. GPS navigation is based on what principle? 1. Satellite  ranging 2. Satellite  speed 3. Satellite  broadcast 4. Satellite  response 1–47. Within how many feet can GPS determine  position  fixes? 1. 50 2. 250 3. 500 4. 1000 4