Onwa 5 inch MFD chart Plotter with built in ClassB+ AIS.

Free AIS set-up if AIS details are provided, Free chart for UK and Ireland. 24 months warranty provided by Authorised Onwa UK Distributor.

KP-25A with built in Class B+ AIS transceiver. Class B+ is the later version of the original Class B two-Watt system but having five Watts output and using SOTDMA transmitting technology (Class B is CSTDMA).  SOTDMA is superior to Class B CSTDMA, not only in being higher power, but also in enabling a transmitting vessel to access a transmission slot in the AIS system even in AIS crowded waters. Class B can reserve a slot but if the AIS system is in heavy use the slot is not guaranteed so it may not be able to transmit until a slot is available. SOTDMA also has an advantage in that the transmission is sent more frequently if the speed of the vessel increases which is highly desirable for high-speed craft such as a RIB. Features of the built-in KP25A AIS transceiver:

Features of this model:

• AIS targets overlaid on the chart
• Class B+ SOTDMA
• Receive sensitivity = > -123dBm (2 channels)
• Transmit power      = > +36.999 dBm (1 channel) 5 Watts
• User adjustable CPA and TCPA alarms (CPA = closest point of approach, TCPA = time to CPA)
• Vessel list shows a list of all AIS vessels transmitting within reception distance selecting any one will show other vessel details including: Vessel name, MMSI, Position, COG, SOG, vessel size and its distance away from your own boat. Note that any vessel calculated to be on a collision course and being inside of CPA or TCPA boundaries will trigger an alarm alert on chart screen and also in detail on the AIS screen.
• AIS target tracking, selecting any vessel enables tracking of that vessel, up to 10 vessels can be selected.
• Has NMEA0183 and NMEA2000. For Wi-Fi add an NMEA to wi-fi converter. See our YakBitz 0183 to wi-Fi converter or our Onwa 0183/2000/wi-fi converter. If you are thinking of using an iPad or phone for Navionics/Garmin Boating App (or similar), message or call as we have lots of experience with this product and lots of satisfied customers using it.

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Aerials: GPS. Puck type GPS aerial included, can be used below deck in a GRP boat provided deck material does not attenuate satellite signal unduly. External GPS available if needed

AIS: an AIS aerial is needed for transmission and reception of AIS