Onwa KP-39A (high sensitivity AIS)

Enhanced AIS version

This is not the standard production KP39, but one with a higher sensitivity AIS – the same V3.6 or KS10 as used in more expensive models.



7 in stock (can be backordered)

The difference between this model and the standard production KP39A:

Both versions have a Class B+ AIS with 5 watts transmit power. The noticeable difference is in the reception range Рyou can expect to approximately  double the reception range over the standard production line version KP39A. This is suitable for users who want to see vessels that are at a greater distance (up to 20 miles assuming a good aerial system). Whilst not necessary for collision awareness it is, nevertheless, interesting to have a broader picture of the AIS equipped vessels over a larger area. A practical advantage of the higher sensitivity AIS receiver would be for lone open water sailors at night as by extending the CPA setting in the collision alarm menu an earlier warning would be received. Note that transmission range will always be less than reception as losses via the aerial system etc. are far greater; expect around half the distance of reception range.

  • Multifunction GPS chart plotter
  • Latest enhanced Class B+ AIS unit installed
  • UK and Ireland K-chart installed – other areas available, can also use Navionics or C-Map
  • IP 65 water protection
  • Tilt and swivel mount
  • Puck type GPS- needs a view of the sky (can be through a wood or plastic roof)
  • External GPS with 10 metres of cable available as an extra but in most installations the Puck GPS will be adequate

Class B+ Technology

  • SOTDMA technology – same technology as used by class A and guaranteed time slot allocation
  • 5 W transmission power – can be seen as far as 10 – 12 nm
  • Increased transmission rate (based on speed)

AIS Features

  • Transmits and receives AIS messages and data from your vessel to class A, class B, AIS base station, AIS buoy (AtoN), AIS SART and vice versa
  • Onwa Marine AIS encrypted technology
  • CPA and TCPA alarms: – these are user definable to activate whenever another vessel is computed to enter a safe zone that you set around your boat
  • Pop up alarm box when AIS rescue alarm (AIS SART or AIS MOB) is received

AIS Tracking Functions

  • Clear overlay of AIS targets on the mapping system (plotter screen mode)
  • AIS target information is shown when the cursor is pointing at an AIS target
  • Optional selection of displaying the name of all AIS targets in real time

AIS Messaging

  • Can send and receive composed messages between ONWA AIS plotters
  • Messages can be broadcasted or can be sent to a specific MMSI no.
  • Message history and number of unread messages can be viewed when a contact is selected
  • Pop up box for incoming message alert


  • Track fishing boats and small commercial vessels with AIS class B type transeivers across the globe
  • Can send standard AIS message and exactTrax message
  • ONWO AIS can connect other sensors to the AIS module such as ultrosonic weather sensor and speed log, to send with exactTrax message
  • In order to use exactTrax, user must avail ExactEarth service

Air Track Recording

  • Ability to record tracks of AIS targets – auto and manual AIS saved tracks
  • Recorded tracks are useful when checking the records during an accident
  • Recorded AIS tracks can be reviewed and displayed in the plotter screen

Optional Accessory

External GPS with 10 metres cable & adaptor BNC to SMA

Click on the image to open

KA-07 External GPS aerial with 10 metres cable

Glomex RA111AIS 162mHz aerial (specifically tuned to AIS frequencies. Stubby/flexible, comes with stainless mount for pole or surface fitting.





7 in stock (can be backordered)

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