mcmurdo NAV6 User manual
NAV6
NAVTEX RECEIVER
USER MANUAL
mcmurdo
mcmurdomcmurdo
mcmurdo
Important Information
This equipment is not approved for use by SOLAS convention vessels within
the Global Maritime Distress and Safety System GMDSS)
It is intended for use by leisure craft and other non-SOLAS vessels wishing to
participate within GMDSS
Safety Warnings
Do not use the sensor as a grab-handle
This instrument is for use as an aid to sailors and should not lead to a reduction
in the level of good seamanship required at all times
Reception of messages cannot always be guaranteed as this depends on local
radio propagation
The correct magnetic variation must be input at the navigation instruments e.g.
GPS, electronic compass) for the accurate display of COG, set, waypoint
bearing and heading.
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. No part of this
publication may be reproduced, stored in a retrieval system or transmitted in any form,
electronic or otherwise without permission in writing from McMurdo. No liability can be
accepted for any inaccuracies or omissions in the publication, although every care has
been taken to make it as complete and accurate as possible.
Copyright 2004, McMurdo All rights reserved.
Contents
1. User Guide ....................................................................................................2
2. Quick Start ....................................................................................................2
3. Introduction ..................................................................................................3
3.1 What Is NA TEX? ..................................................................................3
3.2 How Does NA TEX Work? ....................................................................3
4. NAV6 Features..............................................................................................3
4.1 The NA 6 range.....................................................................................3
4.2 Display Unit ............................................................................................4
4.3 NA TEX Sensor.....................................................................................4
5 Basic Operation..............................................................................................5
6 Advanced Operation ..................................................................................12
7 NAVTEX Mode............................................................................................12
7.1 NA TEX Mode, Message iew ............................................................12
7.2 NA TEX Mode, Print iew§ .................................................................13
7.3 NA TEX Mode, Sort iew....................................................................13
7.4 NA TEX Mode, Filter iew...................................................................14
8 Navigate Mode§ ..........................................................................................17
9 Setup Mode .................................................................................................21
9.1 Setup Mode, General iew, LCD Page ................................................21
9.2 Setup Mode, General iew, Options Page ...........................................23
9.3 Setup Mode, NA TEX iew, Options Page .........................................24
9.4 Setup Mode, NA TEX iew, Options Page, Print Setup§....................25
9.5 Setup Mode, NA TEX iew, 518 and 490 Names Pages....................26
9.6 Setup Mode, NA TEX iew, 518 and 490 Names, Station Database
Setup 26
9.7 Setup Mode, NA TEX iew, Monitor Page..........................................28
9.8 Setup Mode, Navigate iew, Options Page§........................................29
9.9 Setup Mode, Navigate iew, User iew Page§....................................29
9.10 Setup Mode, Navigate iew, Monitor Page§ ........................................30
10 Alarm Operation .........................................................................................31
11 Output to a PC or Plotter§ .........................................................................31
12 Maintenance and Trouble Shooting..........................................................32
12.1 Cleaning ...............................................................................................32
12.2 Faultfinding NA 6 display ....................................................................33
12.3 NA 6hub faultfinding............................................................................34
12.4 User Serviceable Parts.........................................................................35
12.5 Software Upgrade.................................................................................35
12.6 Fuses....................................................................................................35
13 Specification ...............................................................................................36
14 Outline Drawings........................................................................................40
15 Appendix I: NAVTEX Station Database .......................................................41
15.1 518 kHz NA TEX Stations ...................................................................41
15.2 490 kHz NA TEX Stations ...................................................................43
16 Appendix II: Message Type Indicators .....................................................44
17 Appendix III: NA 6 Menu Navigation..........................................................45
18 Appendix IV: Declaration of Conformity...................................................46
19 USER NOTES ..............................................................................................48
20 Product Warranty .......................................................................................49
21 End of Life Statement.................................................................................50
§ See Page 2 for an explanation of this symbol
Page 1
Congratulations on purchasing this NAV6 product. It is not only an excellent NA TEX
receiver, but a first class instrument repeater. It may be the only display you will ever
need at your navigation position. We hope that it gives you many years of reliable
service. Please take the time to read this manual carefully as it contains some
essential information regarding the operation and maintenance of the product and a
useful background to the NA TEX system.
We recommend that you regularly visit the McMurdo product website
www.mcmurdo.co.uk for information on updates, the availability of software
enhancements, further options and support. The support pages contain frequently
asked questions about the NA 6 that you may find useful. There is also a NA TEX
database providing a list of operational NA TEX stations and their details.
.
Page 2
1. USER GUIDE
This user guide describes the operation of the NA 6plus, NA 6Aplus, NA 6dual and
NA 6repeater equipments.
Not all the menu features described are provided by the NAV6dual. Where this is
the case, the symbol § is used to mark the feature.
The NA 6repeater will display NA TEX menu pages only when incorporated with a
NA 6 system or NA 6 sensor.
Installation instructions are provided in the separate NA 6 range Installation Guide.
Further installation information is furnished separately with each NA 6 ancillary
instrument. It is recommended that installation be carried out be a recognised marine
installation engineer.
2. QUICK START
You will find the NA 6 extremely easy to operate. Please don't be intimidated by the
comprehensive nature of this manual. In reality, receiving your first NA TEX
messages could not be simpler.
• Follow the installation guidelines
• Re-check the cable connection
• The NA 6 system has no ON/OFF switch; it will start up as soon as power is
applied.
• If you have not connected a GPS navigation receiver, make sure that you set the
date and time on the screen which will appear at start up.
• Wait for your first NA TEX message. If you are within range of a NA TEX
transmitter, you should not need to wait for more than four hours.
• Refer to “Appendix II: NA 6 Menu Navigation” for an overview of the available
operating modes & how they relate to each other.
• Read the “Basic Operation” section to find out how to use some of the commonly
used features of this product
• If you then want to get the best from the system, read the rest of the manual!
Page 3
3. INTRODUCTION
3. What Is NAVTEX?
NA TEX is a worldwide system for the broadcast and automatic reception of maritime
safety information (MSI) in English by means of a narrow-band direct-printing
telegraphy. NA TEX provides shipping with navigational and meteorological warnings
and urgent information.
NA TEX is an element of the IMO/IHO worldwide Navigational Warning Service
(WWNWS) as defined by IMO Assembly Resolution A.706 (17). It is included within
the Global Maritime Distress and Safety System (GMDSS). Since 1 August 1993, a
NA TEX receiving capability has become mandatory equipment for certain vessels
under the provisions of the International Convention for the Safety of Life at Sea
(SOLAS).
NA TEX broadcast information is available to all seafarers, free of charge.
3.2 How Does NAVTEX Work?
NA TEX transmissions are sent from stations situated worldwide. The power of each
transmission is regulated to avoid the possibility of interference between transmitters.
Each station is allocated a 10-minute time slot every 4 hours so that many stations
can share the same frequency. Stations typically have a transmission range of 250 –
300 Nm.
4. NAV6 FEATURES
4. The NAV6 range
NAV6plus full feature NA TEX with NMEA repeater instrument displays includes dual
channel NA TEX sensor with 10m sensor cable.
NAV6Aplus full feature dual channel NA TEX with NMEA repeater instrument
displays, supports a wide variety of antenna types such as an insulated backstay wire
or active and passive whip antenna systems.
NAV6dual dual channel NA TEX only, includes dual channel NA TEX sensor with
10m sensor cable.
NAV6repeater stand alone NMEA repeater instrument display, can be connected to
NA 6plus/Aplus NA TEX system using a NA 6hub
NAV6plus
NAV6Aplus
NAV6repeater
Dual receiver x x x
NMEA Auto station x x
NMEA GPS Display x x x
NMEA instrument display x x x
NMEA Logging x x x
Display backlight x x x x
Printer / data output x x x
Antenna options x
Note: NAV6dual has no PC or printer interface connection.
4.2 Display Unit
• The Display Unit has a high resolution backlit LCD.
• The display unit contains a large non-volatile memory to store NA TEX
messages.
• Messages can be filtered and sorted.
• The NA 6plus and NA 6Aplus can act as an NMEA instrument repeater and are
capable of displaying data in a choice of formats.
• The NA 6plus and NA 6Aplus can be connected to a printer or computer to print
NA TEX messages and Navigation logs.
• Audible and visible alarms can be set up to indicate reception of SAR and/or New
Messages.
• A sleep mode allows long standby periods with minimum power consumption,
such as when the vessel is left in a marina with main batteries being trickle
charged from the shore.
4.3 NAVTEX Sensor
• The Sensor Unit contains dual receivers that can receive on both 490 kHz and
518 kHz simultaneously.
• The NA 6plus and NA 6dual have a dual channel NA TEX sensor unit.
• NA 6Aplus has the ability to connect to a wide range of remote antenna types by
using the NA TEX Receiver Unit
Page 5
5 BASIC OPERATION
The NA 6 is a flexible & powerful tool for receiving, storing & viewing NA TEX
messages. To assist you in getting the best from your NA 6 equipment, read this
section which contains short cuts to the most commonly used NA TEX operations.
Read the rest of the manual for a comprehensive guide to the NA 6 range.
First, find your way around the keypad and the display.
Centre keys are a ‘navigation pad’ ( UP DOWN LEFT RIGHT ).
Softkeys are situated on either side of the navigation pad. The current
function is shown on the soft-key menu area at the bottom of the LCD.
The MODE softkey switches between the three operating ‘modes’ (NA TEX,
Navigate & Setup).
The IEW softkey switches between ‘views’ in each operating ‘mode’. If a
‘view’ has several ‘pages’ associated with it then these are selected with the
page softkey.
Operate the keys in this order to get to the mode that you want:
MODE → IEW → PAGE → FUNCTION
Softkeys are context sensitive and cyclical in operation; several button presses will
return you to the start of the cycle. As the button is pressed, the softkey labels change
to show the current functions of the keys.
navigation pad
FUNCTION PAGE IEW MODE
The Keypad
softkeys
Page 6
The Display
At the bottom of the display is the softkey menu area:
The softkey menu area shows what each softkey does in the current operating mode.
The top line of each softkey menu box indicates the option that is currently
selected.
The bottom line of each softkey menu box indicates the current function of
that softkey.
The example above shows the NA 6 in NA TEX Mode; the right softkey selects the
mode, and current mode is Navtex.
At the top of the display is a status bar:
The status information is displayed as a series of icons. The meaning of the icons is
as follows:
Message identifier for the top message
An alarm is active
NMEA / GPS position data available
490 kHz reception available
518 kHz reception available
Receiving message now
Signal Carrier, but no message
Sensor communication fault
SAR message received
NEW message received
UTC Time
Current softkey function
Current option
Page 7
Viewing & Scrolling Through NAVTEX Messages
To view NA TEX messages you must first select the NA TEX Mode.
Use the right hand soft key to change modes until ‘NA TEX Mode’ is visible in the
right hand softkey menu box.
You can now use the UP, DOWN, LEFT & RIGHT keys to scroll through any
previously received messages that already show on the display.
UP & DOWN keys scroll line by line
LEFT & RIGHT keys scroll message by message
The messages currently displayed are a sub-set of all the messages stored in
memory. Whether you can see a particular message or not depends upon the current
station selection, message filter and age limit settings and the sort order applied (see
following sections for details).
Message Storage
All received NA TEX messages are stored in the NA 6 regardless of whether you
have them selected for viewing or not. The memory size provides enough storage for
all messages received in any 72 hour period (in fact much longer). You can even
change your mind later and view a message that was received previously but not
displayed at the time by simply changing a 'filter preset' , message 'filter setting' or
'age limit'.
Messages to be displayed are selected from the NA 6 memory by applying a 'filter
preset' and message age limit setting.
After using the NA 6 for a while you may notice that if you receive a particular
message more than once there will only ever be one copy in view. The ICS NA 6
stores only the best version of a message. It even attempts to repair corrupted
messages by comparing copies of the same message!
Filter Presets
The messages currently available for viewing are selected from all the messages
stored in memory by applying 'Filter iew' presets’.
Filter page settings are used to define which messages are in view and which
messages are hidden from view.
To view the 'active' filter preset number go to [NA TEX Mode⇒
⇒⇒
⇒Filter iew]. You will
notice that the left hand softkey is labelled PRESET and a number from 1 to 5 is
visible. This number is the current 'active' filter preset number.
Page 8
Each of the 5 presets has its own 4 filter pages associated with it (518 Types, 518
Stns, 490 Types & 490 Stns)
1 of 5
Preset
490 Types
Page
2 of 5
Preset
490 Stns
Page
3 of 5
Preset
518 Types
Page
4 of 5
Preset
518 Stns
Page
5 of 5
Preset
Pressing the PRESET softkey changes the active preset number. The filter page
settings change as each different preset number is selected. Similarly, the PAGE
softkey changes the filter pages applicable to the selected preset.
IT IS MOST IMPORTANT to understand that the ‘active preset’ is always the filter
that is applied to the NAVTEX message display – even when the preset selection
is not visible.
Presets can be used to switch quickly between different sets of messages filter
selections. For instance, if you want to show ‘weather warnings from all stations in
range’, you can set up a preset number for that specific display.
Tip : Start by using 'preset 1' for normal operation, only use the other presets once you
are familiar with the way presets work and want to switch quickly between different
sets of message selections.
Station Selection
If you leave all NA TEX stations selected for viewing (subject to your current location)
you may quickly become overwhelmed with NA TEX messages.
By filtering out unwanted stations, you can greatly reduce the amount of unnecessary
messages that are displayed. Station filtering can be automatic or by manual
selection.
Automatic selection§ can be used if a GPS is connected to the system. The
'in range' stations are then calculated based on the information stored in the
station database.
Manual Station selection is used whenever a GPS position fix is unavailable,
or can be used to override an automatic selection.
Each key
cycles through
all the available
options)
1 of 5
Preset
490 Types
Page
Filter
View
Navtex
Mode
Page 9
View the current stations settings.
Go to [NA TEX Mode⇒
⇒⇒
⇒Filter iew⇒
⇒⇒
⇒490 or 518 Stns Page].
Pick the required 'preset number' (use preset 1 if you are just starting for the first
time).
Each 'station setting can be changed between On, Off or Auto.
Setting Operation
On Messages from station always in view (see note 1)
Off Messages from station never in view
Auto§ Messages from station only viewed when nearest or in
range depending upon setting (see note 1)
Note 1: messages are only displayed if they also fall within the ageing limit,
error limit and message category filter settings.
An * (asterisk) to the right of the station name indicates that the station is currently
selected.
Automatic Station Selection Using GPS
Many users will just want to display messages from the nearest NA TEX station, or
only from stations that provide information in their cruising area. This is easily
achieved by connecting a GPS receiver and letting the NA 6 system automatically
make the best selection.
Go to the [NA TEX Mode⇒
⇒⇒
⇒Filter iew⇒
⇒⇒
⇒490 or 518 Stns Page].
Select the required 'active preset number' (use preset 1 if you are just starting for the
first time).
Use the LEFT or RIGHT key to move between the 'In Range' or 'Nearest'
setting.
Provided all the station names have ‘Auto’ next to them and the GPS position
fix is valid, an asterisk will appear to the right of the currently selected station
names.
Ensure that all the stations that you want to view have a asterisk by them.
You can still override an automatic selection by 'forcing' an individual station 'ON or
OFF'
To do this, move the cursor over the station name and use the LEFT & RIGHT cursor
keys to change between ON, OFF (or back to AUTO).
You may wish to set your ‘home’ station to always 'ON' so that you can display its
messages even if it is not currently an automatically selected station.
Note that if a valid GPS position fix becomes unavailable, after a short time
Page 10
delay all 'auto' stations will turn on and remain on until the GPS position
returns.
Manual Station Selection
If no GPS position fix is available or no GPS is connected to the system, you will
probably need to manually select or de-select unwanted stations from view.
Go to the [NA TEX Mode⇒
⇒⇒
⇒Filter iew⇒
⇒⇒
⇒490 or 518 Stns Page].
Select the required 'active preset number' (use preset 1 if you are just starting for the
first time).
• Use the UP & DOWN keys to move the cursor over the station name.
• Use the LEFT & RIGHT cursor keys to change between ON, OFF (not AUTO)
Message Filtering
You can further reduce the amount of messages that are displayed by applying filters
to the message categories.
Go to the [NA TEX Mode⇒
⇒⇒
⇒Filter iew⇒
⇒⇒
⇒490 or 518 Types Page].
• Select the required 'active preset number' (use preset 1 if you are just starting for
the first time).
Each message category type can be turned ON or OFF, or made to display NEW
messages only by using the UP, DOWN, LEFT & RIGHT keys.
‘New’ Messages
Sometimes it is useful to know which messages have been received since you last
looked at the NA 6 display. Whenever a message is received the message header
box displays a ‘NEW’ or 'SAR' icon.
Even if a new message is currently out of view, the status bar at the top of the display
will also indicate a ‘NEW’ icon.
Go to [NA TEX Mode⇒
⇒⇒
⇒Message iew]
• What was the PAGE soft key has changed to a NEXT NEW key.
• The left hand softkey is now a MARK READ key.
Once you have read the ‘NEW’ message and want to clear the ‘NEW’ icon, press
MARK READ.
The ‘NEW’ icon will disappear from the message header.
• Press NEXT NEW to move on to the next NEW message.
• Once all NEW messages have been marked as read the ‘NEW’ icon in the status
bar at the top of the display will disappear.
Hiding 'marked as read' messages from view
Messages that have been ‘marked as read’ are still displayed but now without a ‘NEW’
icon.
If you wish, you can automatically hide 'marked as read' messages from view.
Go to [NA TEX Mode⇒
⇒⇒
⇒Filter iew⇒
⇒⇒
⇒490 or 518 Types Page]
• Select the required 'preset number'
• Place the cursor bar over the message categories that you want to hide and
change to ‘New’ instead of ‘On’.
You may wish to leave SAR messages as ‘On’ so that they are not hidden once
Page 11
read.
Displaying the Newest Message
To display the newest message at the top of the display.
Go to [NA TEX Mode⇒
⇒⇒
⇒Sort iew⇒
⇒⇒
⇒Descending Order⇒
⇒⇒
⇒Date Criteria].
The newest message is now at the top of the display.
Caution: Messages are 'date and time' stamped even if there is no GPS
connected and therefore no corrected time reference to work from.
When you first power up the NAV6, if there is no GPS connected you should
manually enter the date and time. From then on the ICS NAV6 will keep time
until power is removed from the system.
The NAV6 'Calendar & Clock' stops while power is off consequently the date and
time should be checked and if necessary corrected each time the system is
powered on.
If the correct time and date is not set, messages will still be date stamped in a
chronological order but the indicated time of reception will then be wrong.
Message Ageing
NA TEX messages become less relevant over time & eventually may just clutter the
display. In order to reduce the number of obsolete NA TEX messages that are being
displayed, the NA 6 uses the concept of a message ‘Age Limit’. By setting an age
limit it is possible to hide older messages from view.
Go to [Setup Mode⇒
⇒⇒
⇒NA TEX iew⇒
⇒⇒
⇒Options Page]
Use the UP or DOWN key to move the cursor over the age limit setting, the
LEFT & RIGHT keys to select a new value.
3 days is an appropriate age limit to select as most NA TEX messages have a
nominal life of 72 hours.
Set a longer age limit if you want to display NA TEX messages going back over
previous days and weeks.
Remember all messages are still stored in memory for a considerable length of time,
consequently increasing the age limit can bring older messages back into view.
Page 12
6 ADVANCED OPERATION
This section provides a detailed description of the ‘advanced’ operation of your NA 6.
The three operating modes are described in detail. Remember to use the right-hand
MODE softkey to switch between the operating modes.
7 NAVTEX MODE
NA TEX Mode is only available if a sensor is
(or has been) connected to the display and the
NA TEX frequency setting on the NA TEX
options page is set to 518 kHz, 490 kHz or
Both.
In NA TEX Mode, the display consists of a
large area dedicated to displaying NA TEX
messages, with a status bar at the top, and
descriptions of the softkey functions at the
bottom.
It is possible to scroll up and down the
messages line by line, using the UP and
DOWN keys. Additionally, you can step through
the display, message by message using the
LEFT and RIGHT keys.
Four different ‘views’ can be selected by pressing the IEW softkey:
Message View
Print View (when enabled in setup)
Sort View
Filter View
7. NAVTEX Mode, Message View
Used to view messages. Each new message can be accessed by a single key press
& then marked as read, if required.
The NEXT NEW softkey should be used to move the next new message to the top of
the NA TEX display, where it can be marked as read by pressing MARK READ. Note
that the message that will be ‘marked as read’ is indicated in the top left of the status
bar. This is particularly useful when the message’s header has scrolled off the top of
the display area.
Page 13
7.2 NAVTEX Mode, Print View§
Allows individual messages to be printed. The ‘Print iew’ is only displayed if the
manual print setting is enabled on the [Setup Mode⇒
⇒⇒
⇒NA TEX iew⇒
⇒⇒
⇒Options Page].
Printing is only possible if an external printer or PC is installed as part of the system.
The NEXT NEW softkey can be used to move the next new message to the top of the
NA TEX display where pressing PRINT will print it.
7.3 NAVTEX Mode, Sort View
From within this view different sort criteria can be applied to change the order of the
messages on the display. The NA TEX Mode display can be sorted in one of three
ways by pressing the CRITERIA softkey:
Sort by Station
Sort by Type
Sort by Date
The sort can be further organised in ascending or descending order by pressing the
ORDER softkey.
Sort by Station
Sorts by station name.
Ascending sort is 490 stations A to Z , then 518 stations A to Z.
Messages are ordered by message category A to Z.
escending sort is 518 stations Z to A, then 490 stations Z to A.
Messages are ordered by message category Z to A.
Sort by Type
Sorts by message category.
Ascending sort is 490 message categories A to Z before 518 message
category A to Z.
escending sort is 518 message categories Z to A before 490 message
category Z to A.
Sort by Date
Sorts by time and date of message reception.
escending sort puts the newest message at the top of the display.
Ascending sort puts the oldest message at the top of the display.
For sort by date to work properly, the correct time and date should be set using either
time data from the NMEA input, or if this is not available, time should be entered
manually at start-up.
The scroll bar at the right edge of the display indicates how far you have progressed
through the filtered and sorted messages.
The total height of the scroll bar represents the total number of messages available for
viewing with the current filter settings.
Page 14
The lighter section of the scroll bar represents the messages that are currently visible
on the screen.
The vertical position of the scroll bar represents how far through the messages you
have scrolled.
7.4 NAVTEX Mode, Filter View
This view allows specific stations to be selected for display and the various message
categories to be turned on or off. Use the filter view to select which message types
from which stations you wish to see displayed.
Presets
Using the filter presets allows quick selection of 5 different filter settings. Once a
preset is selected, the filter settings for that preset may be changed as required. The
filter settings for the active preset will be applied when NA TEX messages are next
viewed.
Press the PRESET softkey to select a preset.
Set up the 5 filter presets for the stations and message types that you use most.
For example:
Preset 1 - all message types from nearest station
Preset 2 - meteorological warnings from nearest station
Preset 3 - navigational warnings from nearest station
Preset 4 - new messages of all message types from nearest station
Preset 5 – new messages of all message types from stations in range)
There are 5 separate Filter iew presets. Each preset has its own set of 4 Filter iew
Pages.
Use the PAGE softkey to select one of the four possible filter pages: 518 Stations, 518
Types, 490 Stations, or 490 Types.
Page 15
Message Categories
The picture shows the 518 Types filter page;
the 490 Types filter page is similar.
Each of the message types can be selected as
either On, Off or New
Use the UP and DOWN keys to select the
message type setting that you wish to edit. Use
the LEFT and RIGHT keys to change the
setting.
Set each message type filter to one of the
following:
Setting Notes
On Message type always
displayed
Off Message type never
displayed
New Message type only
displayed when new.
Messages marked as
read will not appear.
Stations
The picture shows the 518 Stations filter page;
the 490 Stations filter page is similar. Use the
UP and DOWN keys to select the station filter
setting that you wish to edit. Use the LEFT and
RIGHT keys to change the setting.
The ‘Auto Station Filter’ setting can be either
Nearest or In Range. This setting is active only
when you have a GPS receiver connected to
the NMEA input and it applies only to stations
set to Auto. To display messages from the
nearest station to your current position, set the
auto station filter to Nearest.
To display messages from all stations in range
of your current position, set the auto station
filter to In Range.
An asterisk appears next to all stations for
which messages will be displayed.
Page 16
Set the filter for each station to one of the following:
Setting Notes
On Messages from station always displayed
Off Messages from station never displayed
Auto Messages from station displayed only when nearest or in range
depending upon ‘Auto Station Filter’ setting.
Important: You may wish to leave your NA 6 running whilst your GPS or instrument
system is switched off. Be aware that the Navigate data items derived from NMEA
(including position) will time out after a short while. If you have chosen to display only
the ‘nearest’ NA TEX station or stations ‘in range’ it will revert to displaying all
stations that are set to ‘Auto’. As soon as the NMEA data becomes available again
only the ‘Nearest’ or ‘In Range’ stations will be displayed dependant upon your current
settings.
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