Airmar LB150 - Manual (Page 63)

LB150 WeatherStation Technical Manual revision 0.013
Proprietary and Confidential
PRELIMINARY - DRAFT 60
The Wide Area Augmentation System (WAAS) uses a system of land based
reference stations and geostationary satellites to augment the Global Positioning
System (GPS) in order to provide additional accuracy, integrity, and availability.
Several GPS Sentences are able to differentiate between WAAS (Differential)
fixes and those fixes that do not use WAAS corrections.
The available WAAS modes are:
0 – Disable WAAS
1 – Enable WAAS, but report WAAS fixes as GPS (Autonomous, non-
differential). This is provided for backward compatibility for systems that
might not recognize WAAS (Differential) fixes.
2 – Enable WAAS, and report WAAS fixes as Differential.
The default mode is 2.
This setting is stored in EEPROM within the unit, and retrieved on power up.
Option 4:
This option can be used to direct the GPS to use a specific WAAS satellite. This
value is NOT stored in EEPROM.
Option 5:
This option can be used to direct the GPS how to handle type 0 messages. This
value is NOT stored in EEPROM.