Acrartex TerraFix 406 GPS PLB User Manual Page 16

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Y1-03-0174 Rev. E 15
Material High impact and UV resistant plastic
Color ACRtreuse
Weight (less holster) 12 oz (338 grams)
Waterproof Exceeds RTCM Standards - Factory Tested to 10 meters at room temperature
Temperature Range
Operating Class I -40°C to +55°C (-40°F to +131°F) (future accessory)
Class II -20°C to +55°C (-4°F to +131°F)
Storage Class I -50°C to +70°C (-58°F to +158°F) (future accessory)
Class II -40°C to +70°C (-40°F to +158°F)
SECTION 10 - GPSI/O Frequently Asked Question
Q. How do I download position data from my GPS to my PLB?
A. You must have a NMEA 0183 version 1.5 or higher output ready GPS unit and a GPS Interface cable.
The NMEA 0183 optical Interface connector supplied with your TerraFix must be connected to the GPS
interface cable using a universal serial adapter. Turn on your GPS unit and allow it to acquire the
necessary satellites. Make sure the output is set to NMEA 0183 with the GPGGA sentence configured if
necessary. Connect the NMEA 0183 interface cable to the GPS unit and the TerraFix. The TerraFix will
initiate a data preload when the GPS I or GPS I/O button is pressed for more than ½ second and less
than 5 seconds.
Q. How long does it take to down load position coordinates from my external GPS to my PLB?
A. Upon connection with a properly operating and fully acquired GPS unit, the ACR PLB usually take less
than four minutes to synchronize and download coordinates. Subsequent position updates will take from
a few seconds to no more than 20 seconds to complete.
Q. How does the GPS data get from my GPS to the PLB?
A. The GPS unit transmits data as electrical energy through the GPS Interface cable to the ACR optical
interfacing connector. The ACR optical interfacing connector has an infrared LED and sensor located
in it. The electrical energy supplied by the GPS unit is converted to infrared light in the ACR optical
interfacing plug. Data from the GPS unit is transmitted via infrared light to the PLB through the
translucent PLB top cap or lens when the ACR optical Interface plug is properly engaged. The PLB has
an infrared detector that decodes the light pulses. ACR uses an optical Interface design to eliminate the
potential for leaks and corrosion common to mechanically interfacing devices. An external LED flashes
to confirm that GPS data is being sent from the handheld GPS.
Q. Can I download information once my PLB is turned on and activated?
A. No. You must download your GPS coordinates into the TerraFix™ prior to activating your PLB. Once
activated your PLB will transmit your LAT/LON coordinates to the GEOSAR satellites. If no GPS data
has been downloaded into the PLB it will rely on the LEOSAR satellites to obtain the PLB’s position
using Doppler shift. If your PLB contains an onboard GPS (P/N 2798.4) the GPS engine will be turned
on upon activation and will search to acquire your LAT/LON.
Q. Does my PLB need any special set up to accept GPS data from an external GPS?
A. No. If it is hooked to a valid data source, that has been properly set up to deliver NMEA format with the
GPGGA sentence, it will automatically attempt to download the data once the GPS I
or GPS I/O button
has been depressed and will form an emergency message that includes the position data when the
preload function is initiated.
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