1) An error of 0.00025 seconds exists between a satellite and a GPS receiver which are 31500 km apart. Express this error in km i. 0.5 km ii. 7 km iii. 750 km iv. 45 km v. 75 km 2) Because of a very low power transmission of GPS signal, spoofing is a very easy task to achieve. T F 3) Name several global and regional GNSS constellation operating for location based services and timing (Navigation, Positioning and Timing NPT). 4) Assuming there is a .001 second clock error between a satellite and a GPS receiver timing. What does that error in time corresponds to error in distance/location between the two ends? 5) Which of the GNSS systems in question 3 has better accuracy and precisions? .