VHF refers to radio frequencies in the range of 30 MHz to 300 MHz, commonly used for marine communication. 

MF/HF radio systems operate in the frequency ranges of 300 kHz to 30 MHz and are primarily used for long-range maritime communication.

NAVTEX is an international automated service  and provides vital updates such as navigational warnings, weather forecasts, and search-and-rescue alerts.

Inmarsat-C is a satellite communication system used for transmitting text-based messages and data between ships and shore stations.

A weather fax is a system that receives and prints weather charts transmitted over radio frequencies to provide up‑to‑date meteorological information at sea.

An EPIRB is a critical safety device used to alert search and rescue authorities in the event of a maritime emergency

The KVH TracPhone is a marine satellite communication system designed to provide reliable internet, voice, and data connectivity at sea.

Handheld radios are portable communication devices that allow users to transmit and receive voice messages over short to medium distances

A radio repeater receives a weak or low-level signal and retransmits it at a higher power, allowing communication to cover much greater distances.