ACR&Artex GlobalFix iPro - Manual (Page 29)

Y1-03-0233 Rev. J 28
This bypasses the normal, programmed, waiting time of 20 minutes for
the automatic update of GPS position data.
If the new GPS position is acquired, the coordinates will be displayed
after the beacon has completed the Self-Test. If no valid GPS position
data is available, the beacon will keep the previously stored GPS position
data for up to 4 hours. In this case, call ACR Customer Service at +1
(954) 981-3333 for instructions on how to reset the beacon with the
default message.
A new beacon is programmed with the GPS position data set to a default.
If the beacon should be activated, this default GPS position data
indicates to the satellite system that the beacon has no valid GPS
position stored in memory. Once a functioning and compatible external
GPS receiver is properly connected to the beacon, the default data will
be replaced by valid GPS position data, as described in the previous
sections.
5. Internal GPS position system
The GlobalFix
™ iPRO is fitted with an internal GPS receiver that will
determine the coordinates (latitude and longitude) of the beacon’s
position on the globe, to be transmitted to the Cospas-Sarsat emergency
system.
When the beacon is turned on, the internal GPS is immediately turned on
and it attempts to acquire positional coordinates. GPS coordinates can
be acquired any time that the GPS is on, but only valid data is saved.
Once the beacon acquires valid coordinates, the data is included as part
of the next transmitted 406 MHz digital message.
The internal GPS operates on a schedule during which the beacon is on
for a time, actively acquiring coordinates, and off for a time, in a resting
state. The schedule is designed to conserve battery but, at the same
time, assure that navigational coordinates are regularly updated.
6. LED indication of GPS fix
When the beacon is activated and valid coordinates are acquired, the
data is included in the digital message of the next 406 MHz transmission.
The LED blinks green when GPS coordinates are sent.
If a time period of 4 hours passes without the internal GPS receiver being
able to update the last good set of navigational coordinates, the message
transmitted by the beacon will revert back to default data. At this point the
green LED will stop blinking and the red LED will flash. The internal GPS
will continue to seek coordinates and when successful the green LED will
flash. This new data will be transmitted in the next message burst and
the green LED will continue to flash.