Navigation Aids: GPS - QT
Updated: Apr 20, 2021
Lesson Quicktakes cover the items that should be memorized from each of the wifiCFI Lessons. They do not cover all of the lesson details in-depth.
THE NUMBERS:
24 satellites.
6 orbital planes.
GPS RELAY INFORMATION:
ID.
Position.
Time Code.
CALCULATING POSITIONS:
3 satellites needed to receive 2D position (LAT/LONG).
4 satellites needed to receive 3D position (LAT/LONG and Altitude).
5 satellites needed for RAIM.
6 satellites needed for FDE.
RAIM
Receiver Autonomous Integrity Monitoring.
FDE
Fault Detection and Exclusion.
GPS SENSITIVITY MODES:
En-Route:
More than 30nm from departure or destination.
Sensitivity = 2nm.
Terminal:
Within 30nm of departure or destination.
Sensitivity = 1nm.
Approach:
Within 2nm of Final Approach Fix (FAF).
Sensitivity = 0.3nm.
WAAS
Wide Area Augmentation System.
LAAS
Local Area Augmentation System.