Bilge High-Water Sensor


The primary purpose of the Bilge High-Water Sensor is to detect high water levels in the bilge, ensuring early detection of potential flooding issues. This sensor also measures and reports the bilge temperature.

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The Oversea Bilge High-Water Sensor is meticulously designed to safeguard your boat by providing comprehensive monitoring of your bilge. Its primary function is to detect when the bilge water level becomes excessively high, thereby alerting you to potential issues before they escalate. Additionally, the Bilge High-Water Sensor sensor measures and reports the temperature within the bilge, ensuring you are aware of any potentially damaging conditions.

The self-powered wireless sensor sensor features probes attached to a durable 4-foot cable, allowing for flexible installation at critical points within the bilge. When mounting the probes, position them at a water level deemed excessively high, taking into account the normal fluctuations caused by waves and the rocking motion of the boat. This ensures accurate detection and timely alerts, preventing false alarms due to regular bilge water movement.

Housed within the sensor’s internal structure is an advanced temperature probe that continuously monitors the bilge environment. This probe is particularly crucial in colder climates, as it provides warnings when the temperature drops below 39°F/4°C. Such alerts enable you to take necessary precautions to prevent freezing and potential damage to your boat’s systems.

If high levels of water in your bilge are detected, this will be relayed to the Oversea Hub using a long-range radio frequency (RF) connection. The Hub relays the bilge high-water data to the Oversea app on your mobile phone, and generates alerts in the app, by e-mail and/or by SMS based on your specified parameters. Because of the long range of the sensor’s RF connection, you can use a single Hub to monitor bilge high-water sensors on more than one boat, provided the other boats are close by.

The Bilge High-Water Sensor is small (2.75″ x 3.75″ x 1.15″), lightweight (5.5 oz.) and built to withstand harsh marine conditions (IP65/67). It is powered by 2 off-the-shelf replaceable AA batteries, which provide 5 to 10 years of operation per set of batteries.

The Bilge High-Water Sensor ships with a standard 4-foot extension cable, terminating in a 2-prong sensor, as well as with screws, Velcro tape and magnets to mount the sensor box adjacent to your bilge.

Remember, Oversea devices require a subscription to activate, and currently only provides monitoring for boats located in the United States. You’ll find more information on subscription rates in the adjacent subscription tab.

Subscription Information

Oversea subscription costs are determined by the number of devices in your Oversea network and whether you opt for an 1-year or 2-year subscription. All subscriptions are paid in advance for the selected term and will auto-renew unless canceled. You will receive advance notice of any renewal.

A subscription is necessary to connect your Oversea devices to the mobile app. Subscriptions are purchased through the Oversea app as part of the setup process for each device.

  • Hub and sensor subscription

    • $19.99/month

    • Includes: 1 hub and up to 6 sensors.

  • Hub only subscription

    • $14.99/month

  • 3 pack sensor only subscription (no Hub owned)

    • $9.99/month for each 3 sensors

  • Subscription Period: All plans are based on a monthly rate for 1-year prepaid subscriptions.

  • Discount for 2-Year Plans: Customers opting for 2-year plans will receive a 20% discount on the total subscription cost.

  • Satisfaction Guarantee: All subscription plans include a 30-day money-back guarantee for full satisfaction. If you are not completely satisfied with our services within the first 30 days of your subscription, you can request a full refund.

  • Renewal: All subscriptions are paid in advance for the term selected, and will auto-renew unless otherwise cancelled. You will be notified in advance of any renewal.