AVES MARINE Ltd                        Authorised and approved by Onwa Marine Ltd                                UK and EU sales and support 




           ONWA AIS* equipped chart plotters    


* AIS; what's that?......find out by clicking here                    

Higher power Class B+ SOTDMA AIS module installed in all models

All Onwa AIS equipped chart plotters now have the new higher specification version SOTDMA Class B+ installed as standard as a free upgrade from the Class B system we are all used to.

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.

.All these models can use C-Map Max charts, Navionics Plus charts and Onwa's own K-charts. K charts are free to buyers. All these plotters are completely self contained units consisting of a sophisticated multi-function chart plotter with a built in Class B+ AIS transceiver. One model (K7A) even has an echo sounder/fish finder as well.

Onwa's standard warranty of 18 months parts and service

K-chart2 and K-chart 3 supplied free with every plotter, usually the UK and Ireland chart although these enlarged versions that we supply cover a vast area from Iceland in the North to Spain in the South and almost to The Baltic in the East, Any area of the world can be substituted or as an addition.

Onwa AIS plotters 

All Onwa plotters can now use 

NEW KP-1299X

                                              Click on the 1299X image to go to our 1299X page


Introducing a brand new plotter with wi-fi radar function.

New KP1299X 12.1" plotter with Class B+ AIS transceiver, 1 Kw Fish-finder/Sounder and ability to connect to Onwa KR1007 36nm 4Kw X band Radome. Plotter then becomes a radar screen/controller. KR1007 can also be connected via Wi-Fi and a router to a tablet or PC so that the tablet/PC becomes a second screen and controller. Perfect for 1299X on deck and the tablet/PC below at the chart table.

1095.00 + VAT = £1314.00   Freight £10.00 to most of UK (£16.00 to Highlands, IOW etc).

Includes NBM40-50/200 dual frequency plastic thru-hull Transducer, Bronze version available (extra £30.00). thru hull transducer can be installed in-hull in wood or GRP hulls (not-GPR if sandwich construction).

Freight to Europe etc = at cost from UK base

KRA-1007 Radar can be connected via conventional cable or by Wi-Fi

Radome.. £1583.33 + VAT  (£1900) + Freight at cost from UK base

Note, Onwa X Band radar sets are designed for commercial use and are widely used by professionals mariners in Asia. The performance is considerably better than radars produced for leisure sailors  For example, the 60 cm Radome KRA-1007 has a horizontal beam width of just 4 0 degrees - compare that to leisure radars where this is likely to be much greater (think of beam width as focus).

Radar display can be overlaid onto the chart screen - perfect for those of us who want a clear and easy way to interpret the radar targets.                                                                                                                                                       

7 inch models: 

KP39A  £518.00 inc' VAT

Freight £6.99 to UK, please message for other areas. 

This 7" widescreen (16x9) format sunlight viewable screen is a new addition to the Onwa range at a price that really makes a smart new plotter with AIS on your boat affordable at little more than the cost of an AIS Black Box. 



KP-39A 7" 

KP39A is also available with an enhanced super sensitive KSA6 mk2 AIS unit - this version AIS is the type fitted as standard in the more expensive K7 and K99 Onwa plotters.

If you like to see more vessel from further away then this might be for you. 

A comparison test between a standard KP39A KSA3 AIS and a KP39A fitted with an enhanced KSA6 version using the same AIS aerial showed:  

KSA3 standard version   = received 11 targets within 12 miles distance 

KSA6 enhanced version = received 32 within 21 miles distance.  

This version KP39A

£552.00 inc' VAT

Freight £6.99 to UK, please message for other areas. 

Glomex RA111AIS

Need an AIS aerial - we have Glomex RA111 - see foot of this page for details and options.


5" version of the KP39A if space is at a premium on board.

KP38A with 5 inch screen

Identical to the KP39A above - just a smaller version

Measuring only 195mm wide x 120mm high x 70mm deep (170mm high when mounted on its base). Note that for depth - add at least 30mm for cables to exit, NOTE--add 60mm if RG8X AIS aerial cable is used (thicker so needs a greater radius of curve to avoid kinking the cable).

Class B+ AIS transceiver built in

This particular KP38A has an extra high sensitivity KSA6 AIS module installed for enhanced reception - expect around twice the range for received AIS targets.

Onwa K-chart version2 for UK and Ireland included (covers France and Holland as well)

Can also use Navionics and C-Map charts 


£490.00 inc' VAT

Freight £6.99 to UK, please message for other areas. 

KP708A mk2 with Class B+ AIS transceiver

This model has the more conventional 4 x 3 screen format, IP66 water ingress rating and has a less reflective screen than the KP39A - in very bright sunlight this will improve the visibility of the display. If you intend to use your plotter at your helm where the sun can shine directly on it you may want to consider this model over the 39A even though they share a similar screen brightness. If the plotter is sheltered from direct sunlight then it isn't really a consideration. However, on deck you should consider the IP rating - IP66 is appropriate unless the plotter is sheltered. 

Your AIS details set up for you.

£620.00 Freight 6.99 to most of UK £10.00 Highlands and IOW etc


KP708A 7"

£620.00.00 inc' VAT - with patch type GPS and 3 metres cable

£655.00 inc' VAT - with external KA-07 GPS aerial + 10 metres cable + surface mount

This model has everything!

AIS and a dual frequency sounder fish-finder.

K-combo 7A   

This 7" 4 x 3 version is amazing. It not only has the new Class B+ AIS SOTDMA transceiver built in but also a 300 watt nominal, 600 watt max', dual frequency echo sounder/fish finder as well. Comes with a puck type  GPS aerial 3 metres cable, K-chart of your choice. 

Conventional 'mushroom type GPS aerial with 10 metres cable as an alternative to the Puck type is an additional £29.00 

A choice of transom mounted or thru-hull transducer £99.00


Transom mount Transducer

£699.00 inc' VAT 

+ Transducer if required (£99.00) choice of transom mount or thru-hull type.

Freight to most of UK £6.99 ,Highlands IOW etc £10.00

Thru-Hull Transducer


Freight £6.99 to UK, please message for other areas. 

99 series models

The 99 series has been around for a few years now and has justly earned a reputation for superb reliability and usability by sailors all over the world. In 2018 Onwa redesigned the 99 as a mk2 version to incorporate faster processors, more memory and other hardware changes; the improvement is quite noticeable. Considerably faster boot up and generally a lot slicker performance. 

Our lowest ever price on Mk2 KP-1299A

1 Only, Version2 KP1299A.  Brand New - to clear - making way for Version3 stock.                                                              £899.00 + £10.00 freight 

Includes external GPS with 10 metres cable and surface mount fitting

18 months warranty

Free K-chart versions 2 and 3; can also use Navionics and C-Map charts

UPDATE MAY 2020...Just released, version3 1299 series. This new version of the 1299A has a capability to add external equipment (e,g. a sounder or radar) at any time in the future with connection either by cable or wi-fi).

New version3 1299A  £907.50 + VAT = £1089.00                      + freight (£10.00 mainland UK, Highlands £16.00)                                                   

This has a large 12.1" 4 x 3 screen, a built in Class B+ AIS transponder and a low reflectivity screen for improved visibility in bright sunlight. The KP-1299 has always been our best selling product both in AIS and non-AIS versions for customers with the space available to accommodate this model. This is unsurprising as the clarity and readability of that large screen makes it an easy choice.

You should try to see one of these super plotters; the screen image is impressive. If you have the room for a 12 inch screen you should consider one of these plotters - you won't be disappointed. 

Freight  £10.00 to UK (Highlands of Scotland, £16.00) 

Class B+ SOTDMA AIS transceiver 'Black Box'

KS-200A   £299.00 + freight £6.99 to UK, other areas please enquire

AIS transceiver Black Box for reception and transmission of AIS for connection to a non-AIS chart plotter of any make. Can also be used to send AIS targets to a Smart Phone/iPad or PC via wi-fi using an NMEA to wi-fi converter.

Conforms to the Radio Emissions Directive (RED) requirements for use in EU waters.      (certification available on request)

Note that your vessel details need to be set into this device. The procedure requires additional equipment and some knowledge of the product. We will do this for you at no cost.

£299.00 + £6.99 freight (UK)

AIS 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 a mounting bracket that can be screwed to a horizontal surface or clamped to a pole with the U bracket included..


Now stocking a new version - same antenna but with higher quality (extra low loss) RGX8 cable. Cable cut to your specified length and terminated with PL259 connectors at each end. _Note.. one end can be left prepared but unterminated so that cable can be threaded through a 7mm hole - just needs connector to be screwed on to the cable and the centre pin soldered when installation is concluded. Be sure to solder the connection - this is important.  

£65.20 + 2 x high quality PL259 RF connectors £8.00, +RG8X Cable at £1.25 per metre.

Post: £5.99  - free if sold with a plotter

Note....RG8X cable has less attenuation compared to the standard RG58 cable usually supplied with these aerials yet is still pliable enough for easy installation.

RG8X 6.5mm diameter   RG58 5mm

RG8X - Has a considerably thicker inner core, much denser outer braid. As easy to install as RG58.

Attenuation of different co-axial cables;

For AIS, 162 MHz is relevant.  

Note that 3dB attenuation is a 50% reduction in signal level

We will be happy to call you back!


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