QK-A033 Bi-directional NMEA 0183 Multiplexer with SeaTalk Converter

$278.49 ($232.08 excl. VAT)

Combines up to 3 NMEA inputs with a SeaTalk bus…
Advanced filtering and routing functions for input NMEA sentences
Bi-directional USB/WiFi enables connection between navigation devices and Autopilot

In stock




The A033 Bi-directional NMEA 0183 Multiplexer with SeaTalk Converter gives you complete freedom to monitor, navigate and control from anywhere on board.

Simple yet sophisticated, the QK-A033 NMEA multiplexer gives you:

  • Effortless combined data from multiple NMEA, SeaTalk, WiFi and USB devices.
  • Convenient viewing of your combined marine data wirelessly anywhere on your boat to your chart plotter or mobile phones, tablet and laptop.
  • Seamless communication with Autopilots and other NMEA devices through 2 way WiFi and USB connectivity.
  • Flexible routing and filtering options.

The internal SeaTalk converter allows the A033 to listen on the SeaTalk bus and convert SeaTalk data to NMEA messages.


Typical System Configuration

Through advanced filtering and routing, the A033 NMEA enables controlled routing of data to specific outputs, blocking of excess data and overflow reduction.

Without Configuration: The multiplexer converts and combines data received on the listener ports and sends this data to all talker ports, WiFi and USB simultaneously.

Routing options: The powerful routing feature allows the NMEA, SeaTalk and WiFi input data to be routed from any input to specific outputs.

Filtering options: Each input also has a flexible filter that can be configured to pass or block specific sentences. This frees up bandwidth, significantly reducing the possibility of data overflow and resulting loss of data.

Bi-directional WiFi: 2 way WiFi and USB connectivity, the A033 allows for wireless connection to autopilots and other NMEA devices, giving you the freedom to navigate, monitor and control from your iPad, iPhone, Android tablets and other WiFi enabled devices.

Up to 4 devices can connect directly to the A033 wirelessly with no need for an access point.

3 Marine Bi-directional WiFi to NMEA 2000 options diagram. Direct WiFi connection, Connecting NMEA 2000 though to a router or access point, or dissabling WiFi function if needed.


WiFi Connection

The WiFi module is set for direct Ad-hoc WiFi connection as default, with no need for a router. The SSID and password can be changed through QK-A033 configuration software, increasing security and memorability. Up to 4 wireless devices can connect directly to the A033 in Ad-hoc mode.

QK-A033 can also be connected via Station mode using the Configuration software. This allows for greater range and remote access, as well as additional multi-device access.

The WiFi can be placed on standby if desired.

How to connect Marine Electronics to WiFi 


  • Simple, yet sophisticated NMEA 0183 multiplexer
  • Converts Seatalk to NMEA 0183
  • Multiplexer: Combines  up to 3x NMEA 0183 , 1x Seatalk, WiFi and USB data
  • Combined data stream can be accessed wirelessly (WiFi) or through the USB or NMEA ports
  • Bi-directional USB/WiFi allows for communication with autopilots and other NMEA devices
  • LED lights provide status information


More technical info

  • Configurable baud rates: (4.8, 9.6, 38.4k input and output)
  • Wide power supply voltage range: DC 12-35 Volts
  • Compatible with Chart plotters, Windows, Mac OS X, Linux systems Please note, initial configuration may only be performed using a Windows operating system.
  • Compatible with Android and iOS (All functionality excluding USB connection and Configuration)
  • Galvanically isolated NMEA and SeaTalk input ports. (also called opto-isolation. Galvanically isolation prevents unwanted currents between devices, preventing equipment damage and interference with radio signals)
  • Differential NMEA output with galvanically isolated protection
  • Connectable to older RS232 products through optional Protocol Bridge (AS03). For more information, read below


FAQ – How to connect NMEA0183 RS422 to older RS232 devices.

This product uses the NMEA 0183-RS422 protocol (differential signal), however some older chart plotters or instruments may use the older NMEA-RS232 protocol (Single-ended signal).

To ensure A033 compatibility with any older NMEA0183 device, check if your device uses NMEA0183 RS422 or RS232

  • NMEA0183 RS422 devices’ wiring is compatible ‘out of the box’
  • NMEA0183 RS232 will require a Protocol Bridge (AS03) to connect your wiring


Connecting the A033 to an older (RS232) instrument or chartplotter is not a problem, simply order the QK-AS03 Protocol Bridge. Our QK-AS03 Protocol Bridge connects NMEA-RS232 wiring to MNEA0183-RS422 and vice versa, using a simple ‘Plug ‘n’ Play’ connection, with no setup or configuration needed.

You will probably need an AS03 if you are connecting to an older Garmin, Raymarine or Standard Horizon device. The easiest way to check, is to look at the input/output connections on the device that you will connect the multiplexer to. If the input/output connections on your device (Chart plotter, depth reader, etc.) have a TX, RX or GND connection, use a protocol bridge.

If in doubt contact us for advice.


What’s included?

  • 1 x QK-A033 Bi-directional NMEA 0183 Multiplexer with SeaTalk Converter
  • 1 x USB-B cable (1m)
  • 1 x Setup Guidebook


Available to add to your order:


Help and Support

For any technical questions regarding this product, you can visit the forum at https://www.quark-elec.com/forum/ and ask us your question,  it’s regularly checked by our technical team and your question may already have been answered there.

Alternatively, contact us directly, with details of your set up and we will be happy to help.


Useful Links:


Technical Info

Technical Info

Internal Function Diagram

Here’s what’s happening inside the A033.



QK-A033 has the following electrical connections/indicators:

  • 3x NMEA input
  • 1x SeaTalk input
  • 2x NMEA 0183 output
  • WiFi module, WiFi antenna included
  • USB connector
  • LED lights: indicating NMEA In, NMEA Out, Output overflow and Power


[lgc_column grid=”40″ tablet_grid=”40″ mobile_grid=”100″ last=”false”]

INPUTS (listener ports)OUTPUTS (talker ports)
3 x NMEA 01832 x NMEA 0183
1 x SeaTalk1

[lgc_column grid=”60″ tablet_grid=”60″ mobile_grid=”100″ last=”false”][/lgc_column]

Manual / Drivers

Manual / Drivers


Setup Guide

QK-A033 Basic Setup Overview.



Detailed technical specifications. (The ‘Technical Application Note’)



The QK-A033 comes preloaded with drivers.

The device driver is a file that lets the computer know the configurations and specification of the AIS receiver. In case you’ve had software issues, the driver can be downloaded below.


Configuration Software

Check the setup guide for more information.


Compare NMEA Multiplexers

Compare NMEA Multiplexers

For mobile view and PDF click here


DescriptionFunctionDual channel AIS
receiver, multiplexer

Combines AIS, and
NMEA 0183

Outputs WiFi, USB and NMEA
NMEA 2000 AIS Receiver with NMEA Multiplexer+N2K Converter + WiFi + GPS

to USB/WiFi/NMEA 0183/NMEA 2000
Dual channel AIS receiver, multiplexer, SeaTalkTM to NMEA converter

Combines AIS, GPS and SeaTalk1*

Outputs WiFi, USB and
NMEA 0183
NMEA 2000 AIS + GPS receiver with NMEA multiplexer and ethernet

Outputs Ethernet, WiFi, N2K, USB
NMEA 0183 and SeaTalkTM multiplexer

Combines up to 3 MNEA 0183 inputs with SeaTalk1*

Outputs WiFi, USB and
MNEA 0183
NMEA 2000/0183

Bi-directional Gateway

Combines NMEA 2000/0183

Outputs WiFi, USB and NMEA 2000/0183
Bi-directional Multiplexer with Seatalk1* converter

Combines up to 3 NMEA 0183 inputs with Seatalk1*, WiFi and USB input

Outputs NMEA 0183, WiFi and USB
Bi-directional WiFi/NMEA 2000/NMEA 0183/ USB Multiplexer

Included SeaTalk1* to NMEA 0183 converter

Outputs WiFi, USB and
MNEA 2000 and NMEA 0183
NMEA 0183 input✓x1✓x1✓x1✓x3✓x3✓x3
NMEA 2000 input
SeaTalkTM bus input (SeaTalk
AIS receiver integrated
(requires GPS antenna)
✓ Dual channel

BNC connection
✓ Dual channel

SO239 connection
✓ Dual channel

BNC connection
GPS module integrated
(requires GPS antenna)

SMA (A026 only)

USB (NMEA 0183 format) output✓2 way ✓2 way
NMEA 0183 output (RS422)✓x2(A034-B only)
NMEA 2000 network
Power source Powered throughUSB12V - 15VSeaTalk1* bus (12V)12V-15V12V - 35VN2K bus (12V)12V - 35VN2K bus (12V)
MultiplexingMultiplexing✓(A024) AIS+NMEA



AIS+GPS+SeaTalk+NMEA 0183
WiFiAd-hoc and Station modes✓2 way ✓2 way
Option to disable WiFi
Configuration through USB
port. Configuration requires
Windows PC
devices and
through USB
Chart Plotters
* SeaTalk™ is a registered trademark of Raymarine.

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