Questions & Answers

Very likely. Our sensors are designed and tested for strict NMEA 2000 compliance and send standard NMEA 2000 messages (PGNs). They have been shown to work with Simrad, Garmin and Raymarine multifunction displays, as well as other NMEA 2000 certified displays.

Your display also has to support the specific data type, for example the pressure PGN 130314. Check your MFD manual’s list of supported PGNs, or ask us before you order.

Yes. Our sensors connect to a powered, properly terminated NMEA 2000 backbone. If your boat already has one for GPS, depth or AIS, you can usually add a sensor with one T-connector and a drop cable. If not, a basic backbone (power tap, two terminators, T-connectors and cables) is inexpensive and straightforward to install.

SeaTalk NG (Raymarine) and SimNet (Simrad) are NMEA 2000 networks with different connectors. Our sensors work on them with the appropriate adapter cable.

Yes. That’s what the Single Engine Gateway is for. It converts your existing analog engine senders and RPM signal into NMEA 2000 data, so engine readings appear on your modern MFD without replacing senders or rewiring the engine.

You can also add our standalone pressure and temperature sensors to monitor anything the original gauges don’t cover.

Directly from the NMEA 2000 network. There’s no separate power wiring. Our sensors operate from 9 to 32 V DC, so they suit both 12 V and 24 V boats, and each has a low load on the network (for example, our DC current sensors are rated 2 LEN).

Every AOS NMEA 2000 sensor has a built-in Wi-Fi configuration interface. You connect from your smartphone or computer’s web browser. No app or special software is needed. From there you can name the sensor and set the data type it reports, its instance number, and its zero or calibration point.

Step-by-step instructions are in each product’s How-to-Use Guide on our Downloads page.

Give each sensor a unique instance number in its configuration page. For example, set port oil pressure to instance 0 and starboard to instance 1. Your display then shows them as separate readings.

Yes. Most of our customers do. Pressure sensors use a standard 1/4″ NPT thread, so use an adapter if your port differs, and use thread sealer approved for the fluid being measured. Current sensors should be mounted away from strong magnetic fields such as alternators, generators and rotating shafts.

Our team is happy to help you plan an install, including sketches for DIY installers when needed.

Most AOS sensors have a status LED. A steady regular blink indicates normal operation. Other patterns mean things like a configuration change waiting to be saved, or a sensor error such as a loose sensor connector. The full list of blink codes is in each product’s How-to-Use Guide and on our LED Blink Guide.

The latest firmware for our pressure, temperature, current and tank level sensors is on the Downloads page, along with data sheets, manuals and installation guides.

Choose by the pressure range you’re measuring:

• −14.5 to 30 PSI: fuel filter vacuum (Racor-type filters), turbo boost, low-pressure fuel
• 0–100 PSI: engine oil, fuel, water and air. A salt-water version is available.
• 0–200 and 0–500 PSI: hydraulics and marine transmissions
• 0–5000 PSI: high-pressure hydraulics

Each sensor can be set to report as oil, fuel, water, filter, hydraulic, compressed air or other standard pressure types.

Install our −14.5 to 30 PSI pressure sensor between the filter and the engine; a ready-made Racor filter kit is available. As the filter element clogs, vacuum rises. You’ll see it on your display and can set an alarm, so you change the filter before the engine starves for fuel.

• Ultrasonic mounts on top of the tank, never touches the liquid, and measures tanks up to 1 m (39″) deep. It works with fuel, fresh water, grey and black water, and compensates for sloshing.
• Submersible pressure sits at the bottom of the tank, reads level from liquid pressure with about 2 mm (1/16″) resolution, and suits deeper or irregular tanks.

Either type can be calibrated for your tank’s shape. See the Tank Sensor Calibration Instructions on our Downloads page.

Pick the range closest to the highest current on that circuit. Our DC current sensors come in ±10 A, ±20 A, ±50 A, ±100 A and ±200 A. For large house banks, inverters and windlasses, our high-current sensors measure ±300 A and ±500 A on cables up to 4/0. To monitor alternator voltage, current and temperature together, see the Alternator Monitor.

Yes. The NMEA 2000 AC Monitor measures single-phase AC voltage, current, frequency and power. Its inputs are optically isolated from the mains, and it includes a 100 A split-core current transformer.

Yes. The 12-Port Digital Input Module reports on/off status for up to 12 devices, such as bilge pumps, blowers, lights, washdown pumps and winches. For analog signals (0–32 V), the 6-Channel Analog Module converts six inputs to NMEA 2000.

Boat-Pulse watches your boat while you’re away. It monitors battery voltages, high-water (bilge) alarms, temperature and humidity, GPS position and more. When something moves outside the limits you set, it sends you an email alert. It can also act as an intruder alarm and switch your anchor light automatically.

Boat-Pulse reports over mobile data or your boat’s Wi-Fi. A limited-time mobile service is included with purchase. After that, continued mobile reporting requires a service subscription. Over Wi-Fi it doesn’t need mobile service.

After activation, we email you a private, encrypted link to your online dashboard, with up to two months of history. Bookmark it or add it to your phone’s home screen. Keep the link private, because anyone who has it can view your data and change alarm settings. You configure the unit with the free “Boat Vitals BLE” Bluetooth app for iPhone and Android.

It’s designed for long-term unattended use. In sleep mode it draws about 15 mA at 12 V, and it has a selectable low-voltage cut-off that puts it into deep sleep to protect your battery and wakes it when voltage recovers.

All prices on our website are in US dollars (USD).

We ship worldwide. Shipping costs are calculated automatically at checkout for most countries. If your country isn’t listed, contact us and we’ll arrange shipping.

Yes. In North America, our distributor is Gemeco Marine Electronics (info@gemeco.com, +1-803-693-0777). Ask your marine electronics dealer or installer to order through them. In Australia, contact Ultimate Marine Power. For other regions, see our Distribution Network page or buy directly from our online shop.

Yes. We supply sensors for commercial and research vessels and design custom embedded electronics for commercial customers. Our NMEA 2000 / NMEA 0183 Simulator is used by marine manufacturers to test and validate equipment on the bench. Free simulator/analyzer software for Windows is also available. Contact us to discuss your project.

Products manufactured by Across Ocean Systems are warranted against defects in materials and workmanship for one (1) year from the date of purchase, when installed and used according to our instructions. If you think a product is faulty, contact us with a written description of the problem. We’ll assess it and repair or replace the defective part. Return shipping to us is paid by the customer, and labour and travel costs are not covered. The warranty is void if the serial number has been removed or altered.

Email Contact_Us@AcrossOceanSystems.com or call 1-236-688-8948. Your question goes to the people who design our products, and we’ll help with installation, configuration and troubleshooting. It helps to include your boat, your MFD model and the sensor’s product name.

The Vessel Monitoring Smart Alarm System has been discontinued. For remote monitoring, see Boat-Pulse. If you own an existing system and need support, please contact us.