East Anglian Radio Services

EARS | Marine Band Radio

£400 + VAT TOTAL £480

including 1st class delivery

MORE DUE SOON

REAL SCREENSHOTS OF DISPLAY

AIS Characteristics

Frequency Rate

156.025 MHz~162.025 MHz

Access Scheme

SOTDMA

Channel Bandwidth

25 KHz

Modulation

GMSK

Data Rate

9,600 bps

Number of AIS Transmitter

1

Number of AIS Receiver

2

AIS Channel 1

CH 87B (161.975 MHz)

AIS Channel 2

CH 88B (162.025 MHz)

Tx Power Output

>5 Watt (37 dBm ± 1.5 dB)

RX Sensitivity

<-107 dBm @ 20% PER

RX Message Format

AIS Class A and B messages

Comply Standard

IEC-62287 IEC 62287-2 Ed. 2.0:2017

 

 

 

 

 

 Power Supply

10.5 to 30VDC, current drain 1.5A at 12V

7 INCH GPS CHART PLOTTER WITH CLASS B AIS TRANSPONDER

The KP-39A by ONWA is a GPS Chart Plotter with:

 

7″ Colour Display

Built-in Class B AIS Transponder

Free pre-programmed K-Charts

GPS and AIS functions in one compact housing - with easy to use controls and adjustable mounting

 

If you have a small boat, you probably have your VHF radio licence and without doubt, these devices are the next thing to add to improve your safety.

 

We have the smaller model from Matsutek, and these Onwa 7" units also have the facility to overlay a  chart and a reference  map is supplied to get you going. More detailed and up to date maps can be  downloaded from many sources on the net if you need critical data.

 

These are very simple, offer lots of possibilities for the professional and amateur mariner  and are quite easy to install, just needing a power supply from your  boat and the connection of  the supplied GPS antenna and a normal VHF marine band antenna - available from many chandlers and internet sources to match your boat. The large display makes navigation much safer and collision avoidance easier to assess and take action.

 

The  full specification is at the end of the page.

 

For those unaware of them - here's a summary. They are small devices that contain a GPS receiver and with the supplied GPS antenna, know exactly where they are. They also have a built in VHF transponder which uses two of the channels we don't use for voice to broadcast your boats status. If you fully programme the unit it will send your MMSI, Callsign, Type of craft - from leisurecraft to tanker, and your current location and other GPS information. Other craft in the local area will receive this and you appear on their display. Their information is on your display. At the simplest - you can see on a radar-like display all the vessels within range. If you wish you can enter in warnings so that the device will alert you when there is a potential conflict - two courses crossing. It will show your heading and speed once underway, and is a huge aid to safety, making you visible to others, and equally making you aware of the locations of the other local vessels.

 

The built-in map shows coastal features and depths, plus navigation aids. Inland waterways are also displayed and assist navigation.

 

They are really your car GPS, but with all the other users displayed - incredibly useful. They come in various prices, sizes and features up to TV set size versions that can have maps displayed. This version has a modest footprint and easy to read display. It does have some very useful safety features - MOB - man over board being very handy in an accident situation - it grabs the exact position when you press the button so you can easily provide it in your Mayday message. Hit the MOB button and the exact point is displayed. Waypoints to help you plan can be stored - 12,000 are available and it will also store routes and tracks.

 

IS IT EASY TO SETUP?

Yes - you need to supply it with DC power (cable supplied) and install the small magnetic GPS antenna. To be able to receive and send AIS information, you need to source a new VHF antenna. These are available in the usual marine fibreglass style from a number of suppliers including Ebay and Amazon. The unit has an SO239 socket, so requires a PL259 type connector.

 

To set up, apply power and connect the two antennas. The range of the  other vessel indicators depends on the height and performance of the extra VHF antenna. Some of the images here were taken some distance from the sea and with a low antenna height the other  vessels are not in range.

 

All you have to do is add your own information that gets sent to others - including your vessel size. A handy little diagram assists you enter the right figures for length and beam etc.

 

You get the full package with the exception of a VHF antenna which you need to choose to fit your boat. These are available from around £40 via Google.

 

I'm pricing these at £480, and supplies are limited until the next delivery. I'll dispatch via 1st Class signed for or UPS which is currently very speedy.

 

REMEMBER - like VHF radios, you can only insert your MMSI number once, and it needs to be added to your licence. They do work unprogrammed and you will see the other vessels, but they will not know who you are - so register your MMSI if you can when it arrives.

 

Waypoints/icons

12,000 user waypoints with name, symbol,

3 system waypoints: MOB,Start,cursor

10 proximity waypoints

Routes

30 routes waypoint up to 170 points each,

plus MOB and Track Navigation or Goto Track modes

Tracks

8,000 points automatic track log;

10 saved tracks (up to 8000 track points each)

lets you retrace your path in both directions

Alarms

XTE, Anchor drag, arrival, speed, voltage, proximity waypoint,

Timer and AIS (CPA and TCPA) alarm

Drawing

1000 Drawing Marks; 2000 Drawing Lines (40 points each);

1000 Drawing Place Name; 8 colors for Drawing

Pallete

Normal

Daylight exposed to sunlight

Night in dark environment

NOAA paperchart colors

Tides

Built-in Worldwide Tide Data

Position Format

Lat/Lon

Basemap

Worldwide

External Map

Compatible with K-Chart 2.0, K-Chart 3.0, C-Map Max and Navionics+

User Data Storage

Internal backup of user settings or external SD-card

Plot Interval

5secs to 60 mins or 0.01 to 10nm

Plotting Scales

0.001 to 700nm

AIS

700 targets display

AIS Target Tracking

1000 Automatically saved tracks (100 points each)

10 Manually saved tracks (300 points each)

Perspective view

On/off (available for C-Map only)

Celestial

Sunrise/Sunset Moonrise/Moonset

 

 

 GPS Receiver Characteristics

Receiver

50 parallel channel GNSS receiver continuously tracks and

uses up to 50 satellites to compute and update your position

Acquisition time

Cold start: 29 seconds

Hot start: 1 second

Update rate

1 second

Accuracy

Position:3 meters(95%) without S/A

Velocity: 0.1 meter/sec without S/A

SBAS

Supported

Satellite System

GPS and Beidou

Dynamics

Altitude: 18,000 m

Velocity: 515 m/s

Datum

WGS 84 & user defined

Antenna

GPS Patch Antenna

 

 

 GPS Interface

GSP Data

RS232 input/output, NMEA 0183 V3.01 and V4.11

GPS Input Baudrate

Auto Scan (4800, 9600, 19200 and 38400)

GPS Output Baudrate

Selectable among 4800, 9600, 19200 and 38400

 

 

 AIS Interface

AIS Data

RS232 output VDO, VDM, GGA, GSA, GSV and VTG

AIS Output Baudrate

38,400

 

 

 

 

 

 PHYSICAL

Size

187mm(H)X250.1mm(W)X88mm(D)

Weight

1.03 kg

Display

7-inch Color TFT dayview LCD, 800×480 pixels

Waterproofing

Display unit: IP66

Antenna unit: IP66

Temperature range

Display unit: -15℃ to +55℃

Antenna unit: -25℃ to +70℃

 

 

 Equipment List

Display unit

Quick manual

GPS Patch Antenna with 4m cable (SMA connector)

Mounting Brackets

Standard accessories pack

 

 

NMEA Sentence Supported

INPUT

(Auto scan Baudrate)

GGA, GLL, GSA, GSV, RMC, HDG, HDM, HDT

VTG, ZDA, MTW, VWR, VWT, MWD, VPW, VHW

TLL, TTM, VDO, VDM, GNS, MTA

RMA, DBT, DPT, MWV, BWC, XTE, ZDL, WPL, AAM,

APB, BOD, RMB, DSC, MDA, RPM, XDR

OUTPUT

Baudrate: Selectable 4800, 9600, 19200, 38400

GGA, GLL, RMC, GSA, GSV, AAM, APA

APB, BOD, BWC, BWR, DBT, DPT, HDT

MTW, RMB, TLL, VTG, WPL, XTE, ZDA

ZTG, ZDL, MWD, VPW, VWR, VWT

OUTPUT for Autopilot

APA, APB, BOD, XTE

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