ACR Electronics Marine Safety Devices GlobalFix User Manual

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Y1-03-0242 Rev. B 25
APPENDIX A - USING AND TESTING THE GPS SYSTEMS
1. Internal GPS position system
The GlobalFix™ PRO 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.
2. 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.

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