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2 Raystar 120 & Raystar 112LP GPS Receivers - Owner’s Handbook
1 About SD-GPS (RS120 only)
Figure 1-1: The WAAS System
Your Raystar 120 SD-GPS Receiver can then use this correctional data to
refine the GPS positional data it receives. This results in improved
accuracy (typically less than 3 metres) compared with standard GPS
(typically 15 m) or land-based DGPS (typically 10 m).
Availability of WAAS in North America
The area coverage of WAAS includes the entire United States of America
(see Figure 1-2).
Figure 1-2: WAAS Coverage Map
D4910-1
0˚
15˚N
30˚N
45˚N
60˚N
75˚N
15˚S
0˚15˚W30˚W45˚W60˚W90˚W 75˚W105˚W120˚W135˚W150˚W165˚W 15˚E135˚E 150˚E 165˚E 180˚