ACR Electronics Y1-03-0233 Marine GPS System User Manual


 
Y1-03-0233 Rev. D 28
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.