DIGITAL YACHT NAVLINK2 Quick guide

NAVLINK2 WIRELESS
NMEA2000 SERVER
Version 3.10

1. Introduction
Congratulations on the purchase of your NavLink2 Wireless NMEA 2000 Server.
This product replaces our original NavLink2 product and features a new smart web
interface for configuration via a web browser on your mobile device.
It is recommended that your product is installed by a professional installer,
particularly when it comes to interfacing with other equipment.
Before installing and operating this unit, please consult the user manual
of the navigation equipment that you are connecting this unit to.
2. Before you start
You will need the following items and tools to complete the installation:
•The Wireless NMEA 2000 Server (supplied)
•Spare/suitable connection to the NMEA2000 network
•M3 or M4 screws or other appropriate fixings (not supplied).
To receive/display wireless data from the NavLink2 you will need:
•Suitable navigation software running on a PC, iPhone/iPad, Mac or other
wireless device.
•A fully working and powered NMEA 2000 network.
3. Installation
The NavLink2 is IP54 rated (water resistant) and should be installed below deck in a
dry location. When locating the unit you should consider:
•Routing of the NMEA 2000 cable to the network.
•Sufficient space around the unit for cable connections.
•Maintaining the compass safe distance of 0.5m.
•Best location for Wi-Fi reception i.e. not inside a metal enclosure


3.1 –Connecting to NMEA 2000 Network
•Connect the NavLink2 cable, to a spare connector on the NMEA2000 network.
•NavLink2 takes its power (LEN=2) from the NMEA2000 network so no additional
connections are necessary.
•If you are creating a new NMEA2000 network, then you may wish to consider
Digital Yacht’s NMEA2000 Starter Kit, that provides all of the cables, connectors
and terminators required for a basic NMEA2000 network.
•If you are connecting NavLink2 to a non-standard NMEA2000 network, then a
suitable adaptor cable will need to be sourced from the relevant manufacturer;
>SeaTalkNG (Raymarine P/No A06045)
>Simnet (Simrad P/No 24006199)
3.2 –Mounting
•Using suitable fixings, attach the NavLink2 unit to a flat surface.
•Unit may be installed in any orientation.

3.3 –Powering NavLink2
•Apply power to the NMEA 2000 network and the NavLink2 the LEDs should
start to illuminate or flash, as per Table 1…
Condition
STATUS
LED
(Green)
DATA IN
LED
(Yellow)
ERROR
LED
(Red)
DATA OUT
LED
(Yellow)
LINK
LED
(Green)
ON (Solid)
Wi-Fi
STA Mode
Connected
System
Error
Web
Connection
Flashing
Wi-Fi
AP-Mode
Active
Data
Received
Data
Error
Data
Transmitted
OFF
Wi-Fi
STA Mode
Disconnected*
No Data
From N2K
All OK
No Data
To N2K
No Web
Connection
Table 1
* Note –Short flash every 2 seconds indicates NavLink2 cannot connect in STA
Mode, check wireless network is visible and password is correct.
3.4 –Setting up the Wireless Network
•By default, NavLink2’ creates a wireless Access Point (hotspot) on-board your
boat. The Name (SSID) of the Access Point will be “NavLink2-xxxx” where
xxxx is the unique four digit code of your device.
•To connect to the NavLink2 you will need to scan for wireless networks, find
and select it in the network list and then when prompted, enter the default
WPA2 password, which is “PASS-xxxx”, where xxxx is the same, unique four
digit code that is in the hotspot name.
•As soon as a wireless connections is established, the Status LED will stop
flashing and stay permanently ON, whilst a wireless device is connected.
3.5 –Accessing the Web Interface
•The NavLink2 has a built-in web interface that can be used to configure the
unit and display the data that it is sending to apps.

•Any device, connected to NavLink2, can access its web interface by typing
http://192.168.1.1 or http://navlink2.local into its browser’s address bar.
•This will display the Home page shown in Figure 1, from which you can go to
the Data Modes setup, Network Info and Settings pages.
3.6 –NMEA Modes Configuration
•The Data Modes page (see Figure 2) allows you to configure the NavLink2 for
different NMEA data conversions. For each data mode, the NMEA 0183
Sentences that NavLink2 will convert data to/from, are listed.
•By default the NavLink2 will be in Mode 1 –Gateway + AIS Mode, where all
Instrument, GPS, Navigation and AIS data is converted from NMEA 2000 to
wireless NMEA 0183 that the majority of apps support.
•To change mode, simply click on the Mode’s Button and NavLink2 will
immediately switch to the selected mode and store this new mode setting in
its permanent memory.
•You can view what data NavLink2 is outputting over its wireless interface by
scrolling to the bottom of the page (see Figure 3).
Figure 1

Figure 2
Figure 3

•If your app does not support particular sentences or it is receiving the same
data from another device, you can filter certain sentences by clicking the
“NMEA Data Filter” button and clicking the check box next to the sentences
you do not want to receive.
•From this page you can also log the data to a text file by clicking the “Start
Log” button, waiting a suitable logging period and then clicking the “Stop Log”
button. At this point the “Save Log” button becomes active and you can
download the log file to your device.
3.7 –Wireless Network Configuration
NavLink2 has two wireless network modes, selectable on the Settings page.
1. Access Point mode (default) where it creates its own wireless network
that other devices can connect to.
2. Station mode, where NavLink2 will join the boat’s existing wireless
network.
Figure 4
By default, the Access Point tab is selected. From here you can change the SSID
(wireless network name), wireless password, wireless channel and static IP settings

used by your NavLink2. We recommend only changing these settings if you are
experienced in computer networking. Digital Yacht cannot provide support on
specific networking issues.
If you wish to make NavLink2 join an existing wireless network on the boat, set the
WiFi Mode to STA and you will see the settings shown in Figure 5.
Figure 5
From here you can scan for and select the wireless network you want NavLink2 to
connect to and enter the wireless password of this network –click the “Eye” icon
to view the hidden password.
By default, NavLink2 will automatically get an IP address from the wireless network
it connects to (this will be displayed “greyed out” in the IP box). If you want to
control the IP address NavLink2 has on the network, turn off “Auto IP” and enter
fixed IP address settings
Once you have made all the changes, click the “Update Settings” button to apply
the changes and rebootthe NavLink2. After about 20 seconds, NavLink2 will reboot

and join the selected network. It’s “Status” LED will initially flash but then stay ON
if it has successfully joined the network.
If NavLink2 cannot find the selected network or you have entered the wrong
password, the “Status” LED will stay OFF, with just a short flash every two
seconds to indicate that it is trying to connect but failing. If after 3 attempts (30
seconds) it cannot connect to the selected network, NavLink2 will temporarily
return to AP mode, so that you can connect and change the settings.
Alternatively, you can press and hold the Reset button for 10 secs or more, to
reset the NavLink2 to factory defaults.
3.8 –Configuring Other Settings
NavLink2 simultaneously transmits wireless NMEA data in both TCP and UDP
modes, the two network protocols, that the majority of mobile Apps support.
TCP is a device to device protocol, with error checking and hand shaking which
ensures data is always received correctly. It is best for reliable bi-directional data
transfer, but does require that you know the IP address of the NavLink2 and enter
this in to the App you wish to receive the data. NavLink2 can support three
simultaneous TCP connections.
UDP is a broadcast protocol, where NavLink2 just sends out a continuous stream
of NMEA data that any number of devices can receive. It does not know if any
devices are receiving the data and there is no error checking or hand shaking. If
your App supports both UDP and TCP, we recommend using TCP.
On earlier NavLink2 units, it was necessary to select TCP or UDP mode, but now
you only need to select this on the App as the latest NavLink2 supports 3x TCP
connections and a multi-cast UDP connection at the same time.
By default the TCP and UDP connections are on Port 2000, but this can be changed
on the Settings page (see Figure 6). It is important that the NavLink2 and the App
are both set to the same Port and if in doubt just use the default Port 2000.
As a device/app connects to the NavLink2 via TCP, its IP address appears on this
page (192.168.1.63 in the example).

Also on the Settings page, you can check the firmware version of your NavLink2
and the version of its internal NMEA 2000 Gateway processor. The NavLink2 can
be easily updated on this page via the Web Interface, but a gateway update
requires the unit to be returned to Digital Yacht.
Figure 6
4. Normal Operation
The NavLink2 is powered from the NMEA2000 network, so as soon as the network
is turned on, the NavLink2 will boot up.
If it is in the default AP Mode, then within a few seconds you should see its
wireless network appear on your mobile device. If your device is set to
automatically join this network, then it will wirelessly connect to the NavLink2.
This association is indicated by the green Status LED, which initially flashes when
first powered up, but then stays ON, all of the time that a wireless device is
connected to the NavLink2 network.

IMPORTANT NOTES
1. Some devices show a “No Internet” warning when connecting to NavLink2.
This is not a problem, just a warning that NavLink2 has no internet connection
like a wireless router would normally have.
2. Some devices will show NavLink2’s network as having “Weak Security” this is
because we do not currently support the latest WPA3 security protocol but
WPA2 is still very secure and the most common wireless security.
If the NavLink2 is in STA mode, and the wireless network that you configured it to
connect to is available, then NavLink2 will associate with it and the green Status
LED will stop flashing and remain permanently ON. If it loses wireless connection
with that network, it will turn off and briefly flash every couple of seconds.
Every time NMEA2000 data is received, the “DATA IN” LED will flash. On some
large networks, it is not unusual for the yellow LED to be constantly flickering. If
the navigation App sends out some data, the “DATA OUT” LED will flash.
In the event of wireless connection problems, press and hold the Reset button for
4-5 seconds which reboots the interface. In busy marinas with high levels of
wireless activity, reliable connection to the NavLink2 in Access Point mode may be
difficult, but once underway (at sea) a strong and reliable connection will be
achieved.
If you experience wireless connection issues in Access Point mode, try setting
NavLink2 to use another wireless channel. More information on this can be found
at https://digitalyacht.net and then search for “Wi-Fi Congestion”.
You should never see the red “ERROR” LED turn on, except briefly at power up. If
you see the “ERROR” LED flashing, this indicates that an NMEA conversion error
has been detected and the data rejected. NavLink2 is designed to safely carry on
working in this situation, but it will have recorded details of the error in its
memory. Please contact Digital Yacht when convenient and we will investigate
what has happened.
In the unlikely event that the red “ERROR” LED is permanently ON, please contact
Digital Yacht immediately as this indicates a more serious problem has occurred
that is stopping normal and safe operation.

4.1 - Interfacing with Mobile Apps
NavLink2 is compatible with any app that can receive wireless NMEA data and we
have created an online guide on how to connect to the most popular ones…
https://digitalyacht.net/configure-apps-software/
The default IP address and port that the NavLink2 transmits data on are;
IP Address - 192.168.1.1
Port - 2000
If you have connected the NavLink2 to another network in STA mode, and you
wish to use TCP mode, you will need to find the IP address of the NavLink2, which
you can find in the Settings page of the web interface. You will need to access the
web interface using http://navlink2.local
Some apps will let you enter the hostname navlink2.local instead of an IP address
when setting up a TCP connection.
Most apps that support UDP connections do not ask you to enter the IP address
just the port number, however if they do, try setting an IP address of 0.0.0.0
Please note that on both iOS and Android devices, it is best to always completely
close an app, as highlighted in this article.
Some apps, only support a limited number of NMEA sentences and do not like
receiving lots of data. Use the NMEA Mode selection in the web interface to
change the amount and type of data transmitted e.g. for the Navionics Boating
App we have found that Mode 5 “AIS and GPS only” is the best mode to use.