mcmurdo NAV-7 GMDSS Tri-channel NAVTEX Receiver User & Installation Manual
VESSEL IDENTIFICATION INFORMATION Name Call Sign MMSI NAV-7 S/N Antenna Type RX frequencies supported by antenna 518 kHz 490 kHz 4209.5 kHz The technical data, information and illustrations contained in this publication were to the best of our knowledge correct at the time of going to print. We reserve the right to change specifications, equipment, installation and maintenance instructions without notice as part of our policy of continuous product development and improvement.
Contents QUICK START.......................................................................................... 1 INTRODUCTION ...................................................................................... 2 ABOUT YOUR NAV-7............................................................................... 3 OPERATING THE NAV-7 ......................................................................... 4 Navigating the NAV-7 user interface....................................................................
NAV-7 system overview ......................................................................................20 Trunnion mounting the display.............................................................................20 Trunnion mounting the display.............................................................................21 Flush mounting the display..................................................................................22 DISPLAY ELECTRICAL INSTALLATION .......................................
Take the time to read this manual carefully. It contains some essential information regarding the operation and maintenance of the product and a useful background to the NAVTEX system. Regular visits to the McMurdo website www.mcmurdo.co.uk for information on updates, the availability of software enhancements, further options and support are recommended. The support pages contain frequently asked questions about the NAV-7 that may be useful.
INTRODUCTION NAVTEX is a method of transmitting navigational warnings and weather forecasts from designated coast radio stations. All English language transmissions are made on 518 kHz. Each station is allocated several time ‘slots’ during the day, when it is permitted to transmit; these are normally at four hourly intervals. The only exceptions to this are gale warnings and search and rescue messages, which may be transmitted at any time.
The NAVTEX antenna should be mounted where it is elevated clear of metal objects in a location where it cannot easily be damaged. It is essential to read the installation section of the user guide thoroughly before attempting installation of the NAV-7. ABOUT YOUR NAV-7 The NAV-7 has been designed to meet the requirements of IMO MSC.148 (77) and IEC 61097-6 (Ed 2.0). The NAV-7 contains 3 receiver channels, one each tuned to 490 kHz, 518 kHz and 4209.5 kHz.
OPERATING the NAV-7 Switch on the NAV-7 by applying power via a circuit breaker or fuse. There will be a few seconds delay whilst the software loads the contents of the NAVTEX message store during which time the front panel red LED will blink. The NAV-7 start-up screen will now be shown. This screen disappears after 30 seconds; it may be removed sooner by pressing any key. The NAV-7 is now ready to receive NAVTEX messages.
Navigating the NAV-7 user interface The NAV-7 has been designed to be easy to use with an intuitive user interface and softkeys.
Icons The NAV-7 displays various icons in the status bar at the top of the display. SAR, warning alarm Unread message indicator The antenna or antenna cable is faulty The 518 kHz receiver is receiving The 490 kHz receiver is receiving The 4209.5 kHz receiver is receiving The external receiver is receiving Receiving NAVTEX messages When the NAV-7 begins to receive a signal, one or more of the receiver icons at the top of the screen will appear to indicate which of the receivers is active.
Alarms The message category is used to classify the nature of each NAVTEX message. Of particular note are message types 'D' (search and rescue), 'A' and 'L' (navigational warnings) and 'E', 'B' and 'C' (meteorological warnings). When a message with any of these message categories is received the NAV-7 operates its alarm relay contacts and transmits an NMEA "ALR" sentence to the currently selected alarm port.
Message displays view first lines of each message select another message group move cursor to newest message required message selected message select time frame oldest message for messages Message index display view selected message select next (newer) message Go to next group (see text) go to previous group (see text) select previous (older) message Message summary display scroll display up select next (newer) message select previous (older) message scroll display down view first lines of each mess
Message index display The Message index display shows the identifiers of messages from a specific receiver. Unread messages have an “envelope” (*) mark; locked messages (see Full message display) have a “key” (Ñ) mark. Message identifiers can be expanded to show either the first two lines or the full message by selecting the desired message and pushing the appropriate softkey. Messages from another receiver can be displayed using the View softkey, which cycles through the available sources.
Minimising the number of NAVTEX messages displayed After the NAV-7 has been switched on for a while there will be a large number of NAVTEX messages stored in memory. These can be quite overwhelming if the user is looking for particular message categories or an individual message.
SETUP To enter Setup mode, press and hold the ENTER key. This returns to the last page used for Setup the previous time. Understanding NAVTEX message headers At the beginning of each NAVTEX message there is a message header which identifies the source and nature of message, time and date of reception, received frequency and error rate.
Colour coding of NAVTEX message headers The NAVTEX message information bars are colour coded for each type of message as defined in the table below.
Each receiver has its own separate set of message filters; pressing the Select XXXX kHz RECEIVER softkey cycles round the available receivers. The message filter settings are all non-volatile and will be unchanged after a power cycle. By default all Transmitting Stations and Message Categories are selected for display – this is indicated by all the check boxes being empty.
Setup parameter Comment Antenna power Enabled for active antenna or Disabled for passive antenna or Auto sense allows the NAV-7 to detect the antenna type Antenna status Unknown: Active: Passive: Overload: Error: see Troubleshooting guide an active antenna is connected a passive antenna is connected excessive current; see Troubleshooting guide see Troubleshooting guide Signal strength The size of the bar indicates the highest signal strength being currently received by any of the three receivers Mon
Interpreting the diagnostics aids: Use the Receive icon, Signal strength bar and Monitor window to help diagnose installation problems and/or as a check that your NAV-7 is working correctly.
Setup parameter Description Operating Mode Normal – normal use aboard vessel Shore Station – displays all messages including repeats, ignoring filters and 72-hour limit Demonstration – for use at exhibitions, etc.
Setup parameter Comment IBS port speed Selects the baud rate for each serial port. NMEA port speed Print delay Printer width Formats output to suit printer type Monitor source Selects serial interface for monitoring Printer port Selects which serial port is used for printing Bridge port Selects which port transmits NRX sentences Alarm port Selects which port transmits ALR sentences SYSTEM ALARMS An alarm will always generate a message, and will actuate the relay contacts.
LCD SETUP LCD setup day & night modes To enter LCD setup mode, press and hold the illumination key. After a few seconds the LCD setup: Day mode page will be displayed. Use the left and right (t and u) keys to adjust the LCD contrast. Use the up and down (p and q) keys to adjust the LCD brightness. To change the night mode settings, briefly press the illumination key. The LCD setup: night mode page will be displayed. Note: These settings are non-volatile and will be unchanged after a power cycle.
SERIAL INTERFACES The NAV-7 has an IEC 61162-2 compatible serial interface which can be used to connect the NAV-7 to other equipment such as an integrated bridge system or a PC running charting software. The interface operates all the time that the NAV-7 is switched on – there is no ON/OFF control for the interface. The IEC 61162-2 compatible serial interface also allows the connection of a serial printer.
DISPLAY PHYSICAL INSTALLATION NAV-7 system overview (for simplicity, power is shown diagrammatically throughout; fuses, circuit breakers, alternative supplies, etc are omitted) 20
Trunnion mounting the display The standard bulkhead mounting U-Bracket can be used to mount the NAV-7 above or below a horizontal (or near horizontal) surface. Hole size to fit #10 screw: 3.5mm Drilling drawing (mm) Select hole size to suit method of fixing mountings – clear or tapped holes. Rear view of trunnion bracket assembly Ensure that rubber washers are fitted between the trunnion bracket and the plastic enclosure. Tilt the display to the correct viewing angle. Tighten the two thumbwheels.
Flush mounting the display If the NAV-7 is to be mounted through a flat panel, use the flush mounting kit provided. A cutting template is supplied with the flush mounting kit. This template carries full fitting instructions.
