NorthStar 961 Reference Manual

Also see for 961: User manual Reference manual Install guide

Contents

NorthStar 961 Reference Manual Manual pdf 55 page image

Chapter 2 - Introducing the 961/962961/962 Operations and Reference Manual, Rev. A Page 2-11For details on interfacing the Northstar 490 to the 961/962,refer to the Northstar 490 Echo Sounder Installation Manual(GM491).For details on interfacing the 961/962 with other devices, seethe Northstar 961/962 GPS Chart Navigator InstallationManual (GM1901).Introducing GPS and DGPSThis section introduces the GPS and DGPS navigation systems,and describes how these systems relate to the Northstar 961/962. If you’re new to navigation, you may begin withoutunderstanding anything about these navigational concepts.However, Northstar recommends that you read this section atsome point to become familiar with the concept of GPS andDGPS.What is GPS? The United States’ Global Positioning System (GPS) is now fullyoperational. Developed by the U. S. Department of Defense(DOD), the GPS system comprises 21 active satellites withthree additional spares. Using these satellites, GPS encirclesthe earth with navigation data.