Watcheye B Class AIS Transponder Pro

Watcheye is always developing. We’re always looking for new applications, adjustments, extensions and add-ons. Lately we’ve put all our efforts in developing our newest product. As a State of the Art product we present you the Watcheye B Pro.

The Watcheye B Pro is the excellent version of the standard class B AIS transponder. This AIS is designed for the true sailor. For adventure, long distances and better visibility. The B Pro is the extra mile, the step ahead.

Instead of the standard 2 Watt, the B Pro has a transmission power of 5 Watt, which increases range and visibility. With the 5 watt you’ll be visible wherever you are, even in the middle of the ocean. This is made possible using satellites, we will fill you in on the details later. Please note that range depends on numerous things, besides transmission power there are for instance the antenna, its position and cables.

Besides the increased transmission power, the Watcheye B Pro uses the same timeslots as class A AIS (for commercial vessels), which is called SOTDMA. This means a higher frequency and prior to other class B AIS transponders. This feature makes Watcheye leading in AIS once more.

AIS uses timelsots, these are TDMA’s (Time Division Multiple Access). There’s a classification for timeslots for commercial vessels (class A AIS) and leisure vessels (class B AIS):

  • commercial vessels use Self Organized TDMA (SOTDMA) with a transmit range of 2 or 3 seconds and prior to class B AIS.
  • leisure vessels use Carrier Sense TDMA (CSTDMA), with a transmit range of 30 seconds.

Note that transmit ranges may vary due to the ships’ status (moored, anchored) or it’s speed.

Naturally the Watcheye B Pro is also equipped with all core qualities of our other devices, such as WIFI, internal GPS, NMEA0183 and NMEA2000 and waterproof.

technical specifications & downloads

Watcheye B Transponder configuratie


  • 5 Watt transmission to enlarge the range
  • SOTDMA based timeslots, transmitting on a higher frequency and prior to other class B AIS transponders
  • NMEA0183 and NMEA2000 integrated in one system makes it compatible to almost all equipment
  • An internal GPS antenna makes the installation far more easy. If necessary it is possible to adjust an external GPS antenna, whenever the internal antenna has insufficient reception (e.g. steel ships). For this situation we recommend to use the Watcheye mini GPS.
  • External silent button: offers the option to stop transmitting whenever desirable
  • A USB connection: this is useful if the AIS is connected to an on board laptop, however it is also possible to use the USB on a PC to configure the AIS (in this case USB power is sufficient, so no 12V necessary for the installation).
  • ProAIS2 software to configure the AIS and to use as a check to see if everything is functioning as it should
  • CD-ROM with the drivers and ProAIS2 software for PC and Mac and the user manual in several languages. Whenever the PC is connected to the internet the software will automatically search for updates.
  • Waterproof (IPx7)

Personal advice and purchase

Our products are designed to function in extreme conditions and are also easily installed. On this website there are many technical product details. All additional information and advice about the installation will be provided by your local store.

find a agent order online

Technical specifications

Dimensions 140 x 100 x 42 mm (L x W x H)
Weight 250 g
Power DC (9,6V - 31,2 V)
  Average power consumption 170 mA at 12VDC
  Peak current rating 2A
GPS Receiver (AIS intern) 50-channel IEC 61108-1compliant
Electrial Interfaces  USB
NMEA0183 38,400kBaud output
NMEA0183 4,800kBaud input
NMEA2000 LEN=1
WiFi 2,4 Ghz IEEE 802, 11b/g (Access point mode), +18 dBm
Connectors VFH antenna connector (SO-239) USB-type A
External GPS antenna Connector (TNC)
USB type A plug
NMEA2000 standard connector
12 way power input/ NMEA0183/External switch
VHF transceiver Transmitter x 1
Receiver x 2 (one receiver time shared between AIS and DSC)
Frequency: 156.025 to 162.025 MHz in 25 kHz steps
Output power 37 dBm ± 1,5 dB
Channel Bandwidth 25 kHz
Channel Step 25 kHz
Modulation Modes 25 kHz GMSK (AIS, TX and RX)
25 kHz AFSK (DSC,  RX only)
Bit rate 9600 b/s ± 50 ppm (GMSK)
1200 b/s ± 30 ppm (FSK)
RX Sensitivity Less than -107 dBm at 20% PER
Co-channel 10dB
Adjacent channel 70dB
IMD 65dB
Blocking 84dB
Environmental Water resistant to IPx7
Operating temperature: -25 ºC to +55 ºC
Tested to IEC 60945 'Protected' category
Indicators Power, TX-timeout, error, silent mode status