IMO
The International Maritime Organization.
Inmarsat
The 'International Maritime Satellite Organisation' - owns and operates
a constellation of satellites for providing maritime (and land-based)
communications.
Interco
The International Code of Signals book.
Intership
Radio traffic between sea going vessels, leisure or commercial.
ITV
The International Telecommunications Union - an inter-governmental
organisation responsible for the management of radio frequencies
worldwide. Publishes a number of books including the ITU List of Coast
Stations; ITU List of Ship Stations; ITU List of Radio determination and
Special Service Stations; ITU List of Callsigns and Numerical Identities.
(Coast Stations, Radio determination Stations and Special Service Stations
are also covered by ALRSs).
J3E
Single Sideband voice, suppressed carrier - the normal 'class of emission'
on MF /HF SSB Radio voice working channels and on 2182kHz.
LSB
The Lower Sideband of a radio Signal (see also SSB/USB)
Mayday
The voice 'Distress Signal' - derived from the French expression 'm'aidez'
- meaning 'help me'
Mayday Relay
The voice Distress Signal used to transmit a distress message on behalf
of another vessel (i.e., when not yourself in distress).
Medical Advice
Being connected, by radio/satcom, to a doctor, to obtain advice on a
medical problem onboard {See Appendix VI for information required
in a request for medical advice}
Medical Assistance
When the physical presence of a doctor is required onboard; or when
landing/evacuation (by boat or helicopter) of a patient is required.
212 THE NAUTICAL INSTITUTE
