AVES MARINE Ltd (T/A avesmarine.com)            Authorised and approved by Onwa Marine Ltd                                UK and EU sales and support 



KP39 and KP39A 7" 

The two models were released in 2018 and quickly became Onwa's best selling product. We sell loads of these which isn't surprising considering all that the plotters provide in the way of a complete navigation instrument, free charts and Onwa's great back up.

Standard Onwa warranty of 18 months parts and service.

The two versions explained:

KP-39 is a full function chart plotter, 7" sunlight viewable screen and IPX5 water ingress protection. Can use Onwa's own K-chart as well as C-Map and now, with the latest models, Navionics charts also. £330 with free post to mainland UK

KP-39A is exactly the same plotter but with the addition of an AIS transceiver for the added security of seeing and being seen by other AIS equipped vessels (for all large commercial vessels this is mandatory). We sell two versions of this model, one is the standard KP-39A and the second is to our our own upgraded specification and incorporates a more sensitive Class B+ AIS module to see and be seen over a longer distance.                                     £495.00 with free post to mainland UK

KP-39 models specification; 39A has addition of a built in AIS transceiver.

7” widescreen (16x9) sunlight viewable screen

Sun cover      

Water protect to IPX5 (IPX5= water projected by a 6.3mm nozzle against enclosure from any direction shall have no harmful effects).

Swivel and tilt mounting bracket

GPS aerial with 3 metres of cable to SMA connector (10 metre version KA-07 can be supplied as an option)

Can use C-Map Max and Onwa’s own K-chart versions 2 and 3.

All plotters are supplied with your choice of any two K-chart areas of the world

18 month warranty implemented in the UK and backed by Onwa Marine Ltd.

UK based technical support.


GPS antenna supplied with KP39 and 39A, 3metres cable to SMA connector, magnetic base to mount on plotter case. Can be mounted on any surface anywhere within 3 metres of the plotter. 

KP39A using supplied GPS antenna with SMA termination

Important! mount at least half a metre from a steering compass

Having an identical appearance and specification (apart from the 39A badge) this is essentially the same plotter as the KP-39 but having the benefit of an AIS transceiver. 

KP-39A  (standard specification) £495.00 (your order buttons are at the bottom of this page)

Free delivery to UK 

For most sailing needs this is an adequate AIS system.

Our own specification version explained:

New higher power B+ AIS module installed

A  higher specification version of the KP39A with latest enhanced Class B+ SOTDMA AIS installed.

Think of Class B+ as a step between the commercial Class A and the leisure Class B systems.

Class B is transmitted at 2 watts, Class A at 12.5watts and Class B+ at 5 watts. Class B+ has the following advantages over Class B:

Extended transmission range, Class B+_ transmits at over twice the power of Class B

Your vessel information transmitted up to every 5 seconds (Class B = every 30 seconds). For anyone using a high speed craft this is quite important. 

SOTDMA technology - same technology as Class A - has guaranteed time slot allocation. Class B  has to wait for an empty space to be allocated by the AIS system. In crowded AIS areas this means possible delays in Class B sending out data.

Extended reception range; note that this is not a function of Class B+ as such, but, the AIS module that AVES Marine has specified for this version does have better reception performance than the AIS module fitted as standard to the KP-39A model.

Your additional cost for this enhanced version is just £35.00 over the cost of our standard model KP39A.

Class B+ KP39A £530.00 with free post to UK. 

(your order buttons are at the foot of this page)

Aerials and other options.

AIS aerial

To receive and transmit AIS signals you will need to buy a dedicated AIS VHF aerial.

Whilst any Marine Band VHF will work for AIS, you should invest in a dedicated AIS aerial for best performance. Standard VHF aerials are tuned to 156 MHz - around the centre of the marine band and are intended to work reasonably well over the entire marine band. However, the AIS channels exist right at the top of the band at 162MHz. So, for best performance you should have an aerial that is tuned to 162 MHz.

We supply Glomex RA111AIS aerials; a stubby 5" aerial that is both flexible and strong and won't get damaged whilst lines handling etc if mounted low down on a rail. They come with 10 metres of cable terminated at both ends with PL259 connectors and have a mounting bracket that can be screwed to a horizontal surface or cable tied to a pole.

If the standard GPS aerial supplied might not be suitable for your boat:

KA07 GPS antenna can be supplied as an upgrade option for both models if an external antenna with a long length of cable (10 metres) is needed. Can be installed in place of the supplied 39A GPS antenna together with a BNC to SMA adaptor if GPS reception is not 100%  or just use an existing GPS antenna with the adaptor. Whilst the supplied GPS gives excellent results, any antenna is only as good as the signal it receives. Deep down in a boat, particularly one constructed in steel or aluminium, an external antenna may be required. 

£30.00.00 (only if supplied as part of a KP39 or 39A sale)  Usual price £35.00

Adaptor options for KA-07

BNC/SMA adaptor

To use the KA-07 with a KP39 or 39A you will need: BNC to SMA adaptor  



50cm BNC to SMA pigtail connector


Using a KA7 antenna with a BNC to SMA converter

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