Saving Of Navtex Message - Furuno NX-700B Service Manual

1.2.3 Saving of NAVTEX message

Received messages are saved in the memory (SRAM) which is backed up by a battery.
1. The number of messages that can be stored is up to 200 messages for the international
frequency and the local frequency, respectively (The average number of characters of
one message is 500). Consequently, the number of characters to be stored is
200×500×2 = 200,000.
2. The number of characters in one message is up to 8,000 characters (The maximum
number of characters is not defined by the IEC Standard.)
3. A message is deleted from the memory under the following conditions, except those
protected on the [LIST] menu.
- 66 hours have passed after it was received.
- Older message than the 200th message counting from the newest message
4. A message having the character error rate exceeding 33 % is not saved.
5. When a message having the character error rate between 4 % and 33 % (inclusive)
has been saved, and when a better message of the same ID with a less character error
rate than the older one is received, the older message with the worse character error
rate is deleted.
When a message with a character error rate of 4 % or less has been saved, a message
of the same ID is not received.
A message having the serial number "00" is always received regardless of the
character error rate.
6. Each message can be protected from being deleted by the setting on the [LIST] menu.
Protection can be provided for up to 50 messages for the international and the local
frequency, respectively, or up to 25 % of the message memory.
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1.2 Operation Guide