Phase Modulation. A form of amplitude modulation, very similar to FM, used in the VHF maritime mobile service.

Public Switched Telephone Network.

Press to Talk. A switch used on microphones and control lines, to activate the voice path and activate transmitter circuitry.

Radiotelephony (i.e. voice).

Rescue Coordination Centre.

A mandatory Ship Reporting System for the Great Barrier Reef and Torres Strait. Otherwise known as the Great Barrier Reef and Torres Strait Ship Reporting System.

a coastal Vessel Traffic Service declared by the IMO via Resolution MSC.161 (78) as a measure to further enhance navigational safety in Torres Strait and the Great Barrier Reef.

A unit responsible for the efficient organisation of search and rescue services and the operation of these resources within a nominated area.

Radar Target Enhancer. A short range device used on small craft which receives, amplifies and stretches an incoming radar pulse, then re

Receiver or receive frequency