O Conceito de Competência: Origem e Evolução

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Figure 53: NAVTEX receiver

On/Off Switch push turns the power on or off

Menu Button Opens menu/Returns to the previous display

Nav Button Shifts the cursor and display; selects items on menus Enter Button Selects a shown item

List Button Opens the LIST options Print Button opens the PRINT option

Display indicates particulars of a received message Hint Display indicates menu functions

Dim Switch Adjusts the panel and LCD dimmer

(+: raises the setting -: decreases the setting)

Print Paper on the print paper the received message will be printed out Open Button push to replace the paper roll

Print Paper

Navigate Knob

Menu Knob List Knob Enter Knob

Display

Open Button

Print Knob

Hint Display On/Off Switch DIM Switch

 Selection of transmitters, message type

Reception of messages, transmitted using subject indicator characters A, B, D and L, which have been allocated for navigational warnings, meteorological warnings,

search and rescue information, acts of piracy warnings, tsunamis and other natural phenomena, is mandatory and cannot be rejected on the NAVTEX receiver. This has been designed to ensure that ships using NAVTEX always receive the most vital information.

Some subject indicator characters can be used to reject messages concerning certain subjects which may not be required by the ship (e.g. LORAN messages may be rejected by deselecting the B2 subject indicator character H on the NAVTEX receiver on board a ship which is not fitted with a LORAN receiver).

A user may choose to accept messages, as appropriate, either from the single transmitter which serves the sea area around his position or from a number of transmitters. Ideally, the user should select the station within whose coverage area his vessel is currently operating and the station into whose coverage area his vessel will transit next. (See ^{Figure 50})

 Practical tasks

Done?

Select receive station Select received message Select receive frequency

Read message from receive memory

Changing the default settings (display, print etc.) Changing paper

Table 13: NAVTEX practical training tasks

 EGC

As the NAVTEX system covers coastal waters up to about 400 nautical miles only shipping must be enabled to receive MSI beyond the NAVTEX coverage. One of these systems is the EGC.

The EGC system supports two services for selective reception:

EGC receivers can be programmed individually to use this information to select only the required messages, and to reject all others.

Figure 54 on page 161 shows the coverage of the four Inmarsat satellites in connection with 21 Navigational areas / Metrological areas (Navarea / Metarea). In the sea area A4 an EGC reception is impossible because the satellite propagation is hinder by the earth curvature. Navareas / Metareas within the sea area A4 will be supplied with MSI by HF radiotelephony or radiotelex via a coast station.

An EGC receiver is able to receive MSI's in the dedicated Navarea / Metarea automatically.

Figure 54: Inmarsat satellites and Navareas / Metareas

 Geographic area messages and Inmarsat system messages

The following is a list of the different types of MSI which can received with EGC receivers:

 All ships (general call);

 Navarea / Metarea warnings, MET forecast or Piracy warnings to Navarea or Metarea;

 Navigational, Meteorological or Piracy warnings to a circular or rectangular area;

 Search and Rescue coordination to ships to a circular or rectangular area;

 Shore-to-ship distress alerts to a circular area;

 Coastal warnings include the following type of messages:

 Navigational warnings;

 Meteorological warnings;

 Ice reports;

 Search and rescue information, acts of piracy warnings, tsunami and other natural phenomena;

 Meteorological forecasts;

 Pilot and VTS service messages;

 AIS service messages (non navigational aid);

 LORAN system messages;

 GNSS messages;

 Other electronic navigational aid messages;

 Other Navigational warnings (additional to Navigational warnings);

 No messages on hand.

To avoid excessive duplication of broadcasts, the IMO has authorised the following arrangements:

 For a given Navarea 7 Metarea or other area, which is covered by more than one Ocean Region satellite, scheduled broadcasts of MSI, such as navigational warnings and meteorological information, are made only via a single nominated satellite/Ocean Region.

 For a Navarea / Metarea or other area, which is covered by more than one Ocean Region satellite, unscheduled broadcasts of MSI, such as gale warnings, distress alert relays, search and rescue coordination are made via all satellites/Ocean Regions which cover the area concerned.

SafetyNET offers the ability to address MSI to a given geographical area. The area may be fixed, as IMO defined Navareas and Metareas coastal warning area or it may be a user defined circular or rectangular area. MSI is submitted for broadcast using three priorities:

 Safety – Priority 1,

 Urgency – Priority 2 and

 Distress- Priority 3.

Aboard ships MSI messages are received by Inmarsat-C and mini-C type-approved maritime terminals with EGC SafetyNET capability (see ^{Figure 55}).

Figure 55: Geographical EGC transmission

FleetNET offers the possibilities for receiving information transmitted for groups of ships, for fleets or ships of a certain flag state (See Figure 56: Overview of SafetyNET and FleetNET). Information regarding it should be noted, that the participation of FleetNET is liable to pay costs.

Figure 56: Overview of SafetyNET and FleetNET

Information providers authorized to broadcast messages (MSI) through a CES and NCS to SESs which are equipped with an EGC receive capability. (See ^{Figure 57})

Navigational Warnings

Meteorological Warnings

SAR Information

Other urgent/safety information's

Maritime Safety Information (International and national co-ordination)

Co-ordinated Broadcast Services

Area A Area B Area C Area D

Network Co-ordination Station (NCS)

The text below shows a typical safety message broadcasted via Inmarsat-C EGC

Figure 58: EGC navigational warning

The text below shows a typical urgent message broadcasted via Inmarsat-C EGC

Figure 59: EGC weather information

The text below shows a typical Distress Relay broadcasted via Inmarsat-C EGC LES 102 - MSG 7698 - MetWarn/Fore Safety Call to Area: 1 - PosOK

STRATOS CSAT 81.148.5.74 1-MAY-2011 05:44:00 606085 NAVAREA ONE 044

ENGLAND, EAST COAST