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Choosing marine technology shouldn't be complicated. Telemar TNL helps vessel operators equip their fleets with reliable bridge electronics, communication systems and GMDSS solutions that support safety, compliance and operational performance. Backed by decades of maritime expertise and a global support network, we help you invest with confidence and operate without compromise.
GMDSS Equipment Guide
Our GMDSS Equipment Guide helps you to identify the right equipment for your vessels. Simply choose vessel weight parameter, vessel type, sea area and prefered satellite system. The equipment guide will then determine the minimum GMDSS installation requirements for you. The quick GMDSS guide includes the new requirements for the Iridium LT-3100S in sea areas A3 and A4. If you have any questions on your results, please contact us. Click below to start your equipment check.
Your GMDSS support
Everything you need to know about GMDSS terminology.
A1
Sea area A1 means an area within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available, as may be defined by a Contracting Government.
LEO
When the satellite is moving in a low earth orbit, for example at an altitude of 200 to 2000 kilometers.
A2
Sea area A2 means an area, excluding sea area A1, within the radiotelephone coverage of at least one MF coast station in which continuous DSC alerting is available, as may be defined by a Contracting Government.
MF
Medium Frequencies (MF) designated for marine communication range between 1605 kHz to 3800 kHz and are called "t" band.
A3
Sea area A3 means an area, excluding sea areas A1 and A2, within the coverage of a recognized mobile satellite service supported by the ship earth station carried on board in which continuous alerting is available.
MSI
Maritime Safety Information - Navigational and meteorological warnings, meteorological forecasts, and other urgent safety-related information broadcast to ships.
A4
Sea area A4 means an area outside of sea areas A1, A2 and A3.
NAVTEX
Information system for receiving maritime safety information on the 518 kHz (Englisch), 490 kHz (local language) and 4209.5 kHz.
AIS SART
AIS-SART (Automatic Identification System - Search And Rescue Transmitter) is a device that transmits a position-related distress message based on the Automatic Identification System (AIS) protocol. The position and time synchronization of the AIS-SART is carried out via a built-in GPS module.
RMSS
Recognised Mobile Satellite Service.
DSC
Digital selective calling (DSC) means a technique using digital codes which enables a radio station to establish contact with, and transfer information to, another station or group of stations, and Radio Consultative Committee (CCIR).
SAR
Search And Rescue.
EPIRB
Emergency Position Indicating Radio Beacon: tracking transmitter which aid in the detection and location of boats, aircraft, and people in distress.
SART
Search And Rescue Transponder.
GNSS
Global Navigation Satellite System.
SBM
Shore based maintenance.
GMDSS
Global Maritime Distress and Safety Radio System.
SES
Ship Earth Station.
GPS
Global Positioning System.
SOLAS
Safety of life at sea.
GT
Gross tonnage.
VHF
Maritime Radio: refers to the radio frequency range between 156.0 and 162.025 MHz, inclusive. In the official language of the International Telecommunication Union (ITU) the band is called the VHF maritime mobile band.
HF
High Frequencies (HF) designated for marine communication range between 4000 kHz to 27500 kHz and are called "u" band. This is divided into the following sub-bands: 4, 6, 8, 12, 16, 18/19, 22, 25/26 MHz. Only the first five are used for distress and safety communication.
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