Navigation Aids: GPS - QT

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.

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