AS NZS 4869.4:2015 pdf free
AS NZS 4869.4:2015 pdf free.Maritime survivor locating systems (MSLS)
The locating device shall start transmitting as soon as a position fix, SOG, COG and UTC lock are available or 60 seconds after activation if not. Optionally the locating device may also transmit unsynchronized using default settings (see clause B.3 for details), within a period from 10 to 30 seconds after activation. This initial transmission is intended to inform the local vessel that an MOB incident has occurred and allow the position of the vessel to be recorded at that time.
NOTE: In the present document, the terms “UTC lock” and “position fix” are used independently. It is however recognized that in practice it is unlikely that a position fix can be obtained without UTC lock and vice-versa.
The locating device shall begin synchronized transmission with the correct GNSS position within 5 minutes under normal operating conditions.
The locating device shall continue transmission even if the position and UTC lock from the positioning system is subsequently lost or fails. The locating device shall maintain, as best it can, proper timing internally if UTC lock is lost.If a position fix is lost, the locating device shall continue to transmit with the last known good position (see clause B.3).
A single test message burst (see clause B .2) shall be transmitted as soon as a position fix, SOG, COG and time are available. The device shall transmit when UTC lock is available so that SOTDMA is properly synchronized even if the UTC parameters are invalid or out of date. If UTC lock is not available after five minutes the device shall abandon the test mode without transmitting. If the UTC parameters are invalid or out of data the test shall be extended until valid UTC parameters have been downloaded although no further transmission shall be attempted.Activation of the test facility shall reset automatically after transmission of the burst.AS NZS 4869.4 pdf free download.
