Codan 8525B Series Handbook page 78

Using selective call
General information for both modes of operation
The beacon signal consists of four long tones.
Self-identification addresses ending in 99 should be avoided
as these will cause confusion.
No alarm or call is recorded at the receiving Radiophone,
only the Tx indicator flashes.
If the receiving Radiophone is in scan mode, the scan
sequence recommences immediately.
Normal selective call operation is not affected.
5-26
q
Outback HF Radiophone