This paper proves theoretically that GDOP decreases as the number of satellite increases and proposes two recurrence algorithms for calculating the GDOP and positioning solution. These algorithms not only can recursively calculate the GDOP and positioning solution at the same time. but also is very flexible in obtaining the best four satellite positioning solution. the best five satel... https://www.bekindtopets.com/limited-stock-Original-U-S-Vietnam-War-Era-Operation-Igloo-White-Seismic-Sensor-Inert-Rocket-great-price/