ACR Electronics PLB-350C - Manual (Page 17)

Y1-03-0244B 17
5. GPS Testing (GNSS Self-Test)
This test is NOT required as 100% of all GPS receivers that leave ACR have
been tested to ensure they perform correctly. However, if you would like to
ensure your GPS receiver is working, please follow these instructions very
closely.
CAUTION: For PLB-350C models, the following test can not be
performed more than sixty times during the life of the battery pack. Once this
GPS testing feature reaches 60 times, the feature will be disabled by internal
software.
NOTE: The GPS receiver is located under the bottom front portion of the case.
It is imperative that the receiver is not obstructed during Self-test or activation
to ensure that the GPS receiver is acquiring your latitude (LAT) and longitude
(LON) position. This test must be performed outside with a clear view of the
sky.
Press the GPS button for longer than 5 seconds. Observe the beacon for the
entire GPS test. A green LED will indicate that the GPS has been turned ON.
The beacon GPS will remain ON until LAT/LON coordinates have been
obtained or until 2 minutes have elapsed. If good LAT/LON data has been
obtained, a single 406 MHz test burst will be sent out with location data and the
GPS will be turned OFF and the green LED will light for at least 3 seconds. This
LAT/LON data is not saved for use. The green LED indicates that the GPS is
functioning properly and that the beacon is in a location or environment where it
can receive the necessary signals from satellites. If the GPS does not acquire
good LAT/LON data, the GPS will turn OFF after 2 minutes, followed with a
RED LED light up for 3 seconds, and no 406 MHz burst sent out.
GPS Test Sequences (maximum
duration 121 seconds)
GPS Test Guide
Green LED at start followed by
“GPS TEST” displayed,
Green
LED and LAT/LON displayed
Successfully acquired GPS
data, 406 MHz burst sent out
with location data
Green LED at start followed by
“GPS TEST” displayed,
Red
LED
GPS data was not
successfully acquired, no
burst sent out.