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Vesper Marine AIS WatchMate 850 Transponder and Display
Vesper Marine AIS WatchMate 850 Transponder and Display

Vesper Marine AIS WatchMate 850 Transponder and Display

On sale$625.00
Retail Price:$895.00
Your Savings:$270.00(30%)
Part Number:VM-WMX850

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Vesper SP160 VHF/AIS Antenna Splitter [+$209.00]

The Vesper Marine AISWatchMate 850 Transponder

Includes a built-in GPS receiver and patch antenna

  • Designed especially for highest AIS performance.
  • Winner of two international innovation awards.
  • Nominated for the prestigious 2010 DAME Award.

The AISWatchMateTransponder incorporates a built-in GPS receiver and patch antenna with the award winning AISWatchMate collision avoidance display.

Vesper Marine has designed the AISWatchMateTransponder to help avoid collisions at sea. Using the Universal Shipborne Automatic Identification System (AIS), the AISWatchMateTransponder transmits your AIS data and displays data from all AIS-equipped vessels in your vicinity. Audible warning alarms are sounded if a potentially dangerous situation exists.

The alarm sounds whenever a ship is detected that will come dangerously close even though the ship may still be many miles away. You are alerted immediately with the closest point of approach (CPA) and the time until CPA.

Unique and customizable alarm and filter settings help to eliminate false alarms. Ships and alarms are displayed in a prioritized order, assisting you to safely navigate in crowded shipping areas.

The AISWatchMateTransponder has a built-in Class B AIS transponder with GPS receiver and GPS patch antenna. It can be interfaced to other on-board electronics and will provide full AIS output. However, it can be used completely stand-alone and it is not necessary to connect it to any other device.


Integrated AIS Transponder

Includes a built-in AIS Transponder with two channel parallel receiver and transmitter. This high performance transponder means greater range and increased safety. It also makes installation easier. No external "black boxes" to mount, power and wire. Just plug in a VHF antenna and connect the AISWatchMateTransponder to your 12 or 24 volt power supply.

Integrated GPS Antenna

Includes a built-in GPS patch antenna that provides GPS data to the integrated 50 channel GPS receiver. This internal patch antenna allows for simple installation. However if needed, an external GPS antenna connection is provided and an optional external antenna is available.

Fully Water Proof Including USB Connection

The waterproof USB connection can be used to power the AISWatchMateTransponder during configuration and makes for an easy connection to onboard or home computers, if required.

Anchor Watch

This is a new feature we have introduced to the AISWatchMate850 Transponder. It enables you to mark where you dropped anchor and sounds an alarm if your vessel moves outside a preset circle.

Target Plot

Provides a radar-like display of all vessels within the selected range. The display can be oriented north-up or heading-up so it's very easy and natural to interpret. Dangerous and lost targets are readily identified.

Graphical Plot Shows Crossing Situations

Shows the relative position of a target vs. your vessel at the closest point of approach. This provides a graphical view of the crossing situation and clearly indicates whether a target will pass ahead or behind.


Computes the closest point of approach and time until CPA. Alarms may be based on these and other factors.

Bearing and Range

Computes the bearing and range to each vessel. Bearing can be displayed in magnetic to facilitate easy visual identification using your compass and binoculars. Bearings can alternatively be displayed in true or relative to your vessel's heading.


Vessels and alarms are presented in priority order.


In crowded operating areas the AISWatchMateTransponder eliminates clutter and false alarms with sophisticated filtering options.

Identify your "fleet"

Targets marked as members of your fleet are displayed with a special icon. Use this to indicate your friends or vessels you commonly work with.

CPA alarm

Triggers alarm if a vessel will come too close. Full control of alarm parameters.

Guard alarm

Sounds alarm if any vessel comes within the specified range. Both CPA alarms and guard alarms may be used together.

External alarm trigger

In addition to the internal alarm, an external buzzer, alarm, or signal light can be interfaced without requiring any additional relays (max 150mA).

Concise and easy to read displays

Uncluttered easy to read display shows all available AIS data.

Class A and class B

Displays AIS data received from all class A and class B transponders.

Safety messages

Displays received AIS Broadcast Safety Messages. These messages may contain important safety, navigation, weather, or shipping information. An AIS mayday safety message can also be sent directly from the AISWatchMateTransponder.

Aids to navigation

Full support for AIS aids to navigation including off-position and virtual aid indicators.

Meteorological and hydrographic display

Displays real-time wind, current, tidal and much more in areas where this information is broadcast.

GPS receiver

Displays built-in GPS satellite status and navigation data such as your position, heading, course and speed.

Large backlit LCD

Adjustable daylight viewable backlit 125mm (5") LCD.

Easy to use

Four buttons control all features. Each button is clearly labeled on-screen. Buttons are backlit for night time use and illumination brightness is controllable. Each setting has on-screen help.

Ultra-Low power consumption

Designed for minimal power consumption, the AISWatchMateTransponder is extremely well suited for energy conscious vessels.

External interface

The AISWatchMateTransponder provides complete AIS and GPS output and is easily interfaced to chart plotters, radars or computers.

Silent Mode

Allows AISWatchMateTransponder to be put in Silent Mode.

VHF "in use" Indicator

Unique VHF in use indicator (when used with Vesper Marine's VHF splitter).

Self Diagnosis

Self diagnosis to provide warnings if AIS, GPS or antenna are not functioning.


Easy installation

Installation is simplified with the AISWatchMateTransponder. No external "black boxes" are required. Simply plug in a VHF antenna and connect the unit to your 12 or 24 volt power source.

Increased Safety

Your safety is increased when offshore or in busy traffic areas.

Safety at night

When night falls or the weather is bad it is often difficult to see other vessel's lights or determine their direction. The AISWatchMate shows immediately which way the vessel is moving and will even plot the crossing situation.

Positive Identification

You'll have each vessel's name and call sign and others using AIS will also have yours. If you wish to call another vessel you will be able to ensure you are talking to the correct vessel. This is very important when operating in busy areas or in bad weather when visibility is reduced.

Operates on very low power

Energy conscious users know how important low power operation can be particularly on a long voyage when charging from solar or wind. The AISWatchMate consumes far less than a radar, chart plotter or computer.

Stand-alone unit doesn't require chart plotter, computer or radar

The AISWatchMate is easy to interface to these devices but none are necessary for its operation. The AISWatchMateTransponder is a fully stand-alone AIS collision warning solution.

Anchor Watch

The AISWatchMate850 Transponder includes the Anchor Watch feature, allowing you to mark where you dropped anchor and sounds an alarm if your vessel moves outside a preset circle, indicating that you have begun to drift outside your set radius.

The unique Anchor Watch screen enables you to see the bearing from your vessel to the marked anchor location, the distance between your vessel and the marked anchor location and shows the periodic position of your vessel as dots, indicating how your vessel has moved while anchored.


EnvironmentalWatertight (USCG CFR-46, IPx7)
Number of receivers2 AIS, 1 DSC (timeshared)
Receive Sensitivity-113dBm
Number of transmitters1 AIS
Size*208mm wide x 135mm high x 76mm depth (8 3/16 x 5 5/16 x 3)
LCD panel125mm (5) FSTN 320x240 backlit
Operating temperature-25C to +55C (-13F to 131F)
Power supply12-24 VDC 3 watts nominal
TX Power output33 dBm (2W)
External alarm Maximum150 mA
Serial data1 USB port (mini), 1 NMEA input (RS422), 1 NMEA output (RS422)
GPS50 channel, TNC for optional antenna
VHF antenna requiredPL-259 connector. 50 ohm, max 2:1 VSWR
StandardsIEC 62287, IEC 60945, IEC 61108, IEC 61162, ITU-R M.1371, ITU-R M.825, ITU-R M.1084
ApprovalsBSH, BABT, CE, US Coast Guard, US FCC, Transport Canada

* Size does not include bracket or cable

Specifications may change due to product improvements.

Downloads for all Vesper products can be found here.
5 Stars
great product
Excellent design especially for the offshore Cruiser. Installed quickly. Internal GPS works thru my deck just fine. Sensitivity is good. RX Range at times up to 35 miles or more. If I had one wish it would be to minimize the size of the unit to the scale of the screen and buttons. I just don't have anywhere to install it permanently in my panel since it is too big and deep.
Did you find this helpful?  7 of 7 Found Helpful
Reviewed by: (Verified Buyer)  from NW USA. on 9/7/2013
5 Stars
Excellent piece of gear
I installed the Vesper transponder prior to a recent singlehanded passage from British Columbia to Hawaii. It picks up targets much further away than another AIS receiver I have on board, and is very simple to use. Alarm is not very loud, but it is simple to hook up an external alarm. Only small complaint is that there is no written manual - just an electronic one. Overall an excellent piece of gear.
Did you find this helpful?  7 of 8 Found Helpful
Reviewed by:  from Honolulu. on 8/21/2012
5 Stars
forensic products specialist
I highly appreciate the WatchMate 850. easy to use, user friendly interface and the profiles setting is really smart. And as a bonus, the anchorguard saved us 2 nights within the first two weeks after installation.
Did you find this helpful?  5 of 5 Found Helpful
Reviewed by:  from Stockholm, Sweden. on 5/31/2011
5 Stars
This is a great piece of gear! Instrumental on a recent delivery from Seattle to San Diego. Easy to use, almost intuitive. Stop debating, buy it.
Did you find this helpful?  4 of 4 Found Helpful
Reviewed by:  from San Diego. on 6/18/2012
5 Stars
The AIS Watchmate 850 has worked very well and has already helped me avoid a close call with a tug alongside an unlighted barge at night.
Did you find this helpful?  4 of 4 Found Helpful
Reviewed by:  from Bellingham, WA USA. on 12/21/2011
5 Stars
Fantastic Device
The best piece of equipment installed so far this past year. Simple to use, easy to install, interfaces with other systems and Rose Point with ease
Did you find this helpful?  3 of 3 Found Helpful
Reviewed by:  from Chicago. on 6/7/2012
5 Stars
Excellent service
Thanks for good service, product was delivered promptly and without problems. Good price and documentation. Not installed yet as the boat is far away and have to wait for summer
Did you find this helpful?  2 of 5 Found Helpful
Reviewed by: (Verified Buyer)  from Canada, west coast. on 3/2/2015

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