ACR Electronics PLB-350C Product Support Manual page 13

The same GPS data will be sent with each 406 MHz signal for the next twenty
minutes. At that time the internal GPS will start up again, search to find your
LAT/LON and incorporate it into your next 406 MHz signal. If for any reason the
internal GPS cannot update your LAT/LON, your last position will be used for
the next four hours. At that time the green LED will stop blinking and the red
LED will flash once every 2 seconds until new GPS data is obtained.
10. GPS receiver orientation
When activated, it is critical that you do not cover the beacon with any body
part, water, clothing, etc. The GPS receiver is located under the bottom portion
of the case behind the ACR Electronics‟ logo (see Figure 4).
To ensure optimum performance of the GPS receiver, the beacon needs to
have an unobstructed view of the sky. Avoid submerging the GPS receiver in
water if possible. Water will shield and inhibit the GPS receiver and may cause
difficulties obtaining your GPS coordinates. Avoid leaning over the beacon to
view blinking LED as you may shield the GPS reception.
Figure 4 – GPS Receiver Location
11. Turning off the beacon
To deactivate your beacon; depress the ON/OFF ( ) button for more than 4
seconds. Once the beacon is deactivated, all blinking LED‟s will stop, signifying
that the beacon is no longer sending your distress message.
If deactivation should fail, remove the six screws holding the unit together and
unplug the battery to disable the unit. Return the beacon to ACR Electronics for
service.
NOTE: Leave beacon on until rescued. Turning beacon off will prolong or
prevent rescue. Repeated activations could be viewed as a hoax.
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