The Commissioner of Police is the Hazard Management Authority for Sea Search and Rescue (SAR) in Western Australia. Further details on the Water Police are at
https://www.police.wa.gov.au/About-Us/Our-Agency/Specialist-Units/Water-Police

Police Contact Details

Emergency 000
for life threatening situations

Police Assistance 131 444
for non life-threatening situations

Fremantle Water Police (08) 9442 8600

Mandurah Water Police (08) 9583 9200

Marine Radio VHF Channels 16 and 67