Lessons

Echo sounder controls

The most common and basic echo sounder controls are: The illumination control, which regulates the illumination of the panel and other controls. The range selector that selects the basic ranges according to the technical specifications. In...

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Main types

There are three main types of echo sounders: The neon rotating display echo sounder, the echo sounder that produces a continuous record of the depth of the water using electrolyte paper and the digital echo sounder. Other echo sounders have...

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Lead line

The simplest form of an echo sounder is a lead line, 60 feet long, attached to a 1 to 1,5 kilogram lead weight. In the base of the weight is a cavity used for taking sea bed samples, which are useful when piloting or anchoring. The line has a...

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Introduction

The Global Maritime Distress and Safety System (GMDSS) was developed by the International Maritime Organization (IMO). GMDSS is an internationally recognized distress and radio communication safety system. The system uses satellites and digital...

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Coverage areas

GMDSS uses 4 coverage areas: A1, A2, A3 and A4. These areas together cover the sea areas of the world. Sea Area A1 is an area within Very High Frequency (VHF) range of a coast station fitted with Digital Selective Calling (DSC). This range is...

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Equipment needed

Depending on how far from shore you will operate your craft, the following minimum GMDSS equipment should be on board. Remember, you are not limited to having only the minimum recommended devices. In an area of operation up to 5 miles from shore...

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GMDSS system

GMDSS system uses the following communication devices DSC Radios, EPIRB, SART, NAVTEX, INMARSAT. DSC Radios profive automatic transmitting and reciving messages. VHF DSC Radios automatically watch on channel 70. Which is a non voice channel an...

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Navtex introduction

Navtex is an automatic broadcasting and reception system for maritime safety information. It uses narrow-band direct printing telegraphy. It supplies shipping and leisure craft with vital information, such as navigational and meteorological...

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Navtex broadcast

All Navtex broadcasts are made on 518 kHz from localized stations situated worldwide. Navtex users can set their receiver to specific message types, such as Ice reports or Satnav messages, and can reject others. However, navigational warnings and...

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Epirb

EPIRB Emergency Position Indicating Radio Beacon Mostcommon epirb operates on 406MHz using polar orbiting satelites. Its the simplest means of comunication, providing only one way of communication. The EPIRB transmits a distress signal and a...

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Sart

SART Search And Rescue Transponder Sart is solely a homing device for the search and resque units, and operates in the 9GHz frequency band. Transmited signals from the SART are displayed on radar screen, providing visual information of distress...

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Inmarsat

INMARSAT Operates 4 geostationary satellites, geostationary means that satellites rotates at same speed and dirrection as the Earth. Satellites arecapable of transmittingVoice, Fax, telex and data. Satellite communication should be considered...

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Introduction

The Global Positioning System (GPS) is a satellite – based aid to navigation system placed into orbit by the United States Department of Defense. The system consists of 24 satellites, orbiting the earth twice a day at an altitude of about...

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Radar description

Radar gets its name from a system of Radio Detection and Ranging. How does radar work? Radar transmits short pulses of radio waves that travel outwards, basically in straight lines. When these waves hit a surface, like a vessel or a buoy, some of...

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