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EG50 & EP50
4.4 Indicator lamps
4.4.1 Strobe (white)
The strobe is the visual means of locating the EPIRB. When activated,
the strobe flashes (approximately) 21 times per minute, with a pause
during the time when the EPIRB is transmitting on 406 MHz.
4.4.2 Red LED
The red LED is used to indicate transmissions by the EPIRB. When
activated, it flashes alternately with the strobe to indicate a good
transmission on 121.5 MHz. Every 50 seconds it illuminates for 2
seconds to indicate a good transmission on 406 MHz; immediately
before the transmission the LED flashes rapidly as a warning to the
user.
When the EPIRB is first activated the red LED is illuminated
continuously until the EPIRB begins to transmit, when it begins to
flash.
4.4.3 Green LED (fitted to EG50 only)
The green LED flashes alternately with the strobe 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 406 MHz.
Every 20 minutes the GPS receiver updates its position information. If
a fix is not obtained, the green LED stops flashing, and illuminates only
every 50 seconds (when the previous position information is
transmitted).
All LEDs also indicate the results of self-test – refer to section 10.1
4.4.4 Interpreting the LEDs
There are three principal indications to the user:
• If the red LED is ON continuously, the EPIRB is active but has
not yet made a transmission. There is time to turn it off without
causing an alert.
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