User's Manual

10
5.4 Lamps
5.4.1 Strobe
The strobe is the visual means of locating the EPIRB. When activated, the strobe
flashes 23 times per minute, with a pause during the time when the EPIRB is
transmitting.
The strobe is also used to indicate the result of a self test (see section 11.1).
5.4.2 Red lamp
The red lamp is used to indicate transmissions by the EPIRB. When activated, it
flashes alternately with the strobe to indicate a good transmission on 121.5MHz. Every
50 seconds it illuminates for 2 seconds to indicate a good transmission on 406MHz.
When the EPIRB is first activated the red lamp is illuminated continuously until the
EPIRB begins to transmit, when it begins to flash.
The red lamp is also used to indicate the result of a self test (see section 11.1).
5.4.3 Green lamp
The green lamp flashes to indicate that a valid position has been obtained by the GPS
receiver. Every 50 seconds it illuminates for 2 seconds to indicate that the position is
being transmitted on 406MHz.
Every 20 minutes the GPS receiver updates its position information. If a fix is not
obtained, the green lamp stops flashing, and illuminates only every 50 seconds (when
the previous position information is transmitted).
The green lamp is not used during self test.