No crew on board.
No margin for sensor failure.

Because the sea is never flat, and float sensors were never designed with that in mind. A conventional float sits on the surface of the liquid inside the tank. When the vessel is underway or the sea state deteriorates, the liquid becomes turbulent and the float moves with it. What the system reads is not tank level. It is the behaviour of the surface of the liquid, which on a vessel in any meaningful sea state is not the same thing.

Gill capacitive sensors solve this at the point of physics rather than the point of data correction. Measurement takes place inside the probe, where liquid enters through small holes at the base. At the bottom of the tank, turbulence is at its lowest regardless of conditions above. There is no moving part to follow the surface, because there is no surface being followed.

Yes, and the approvals cover the full range of environments where it is deployed. WindObserver holds Lloyds Register approval and is used by commercial marine operators and national navies in dynamic positioning systems across the global fleet. The intrinsically safe WindObserver IS holds IECEx, ATEX and UKEX certification for hazardous area installation on offshore platforms and naval vessels.

WindSonic holds separate approvals: accepted by the UK CAA and FAA as part of an automatic weather observing system, and WMO-compliant for gust measurement. If your programme has a specific approval requirement not listed here, contact Gill directly before assuming it is not met.

Yes, without custom engineering in most cases. WindObserver and WindSonic output NMEA 0183 as standard, making them directly compatible with the majority of vessel management systems, dynamic positioning platforms and autonomous navigation stacks. Level sensors output 0–5V analogue, compatible with standard data acquisition hardware.

For naval and defence programmes where output protocol or connector format falls outside the standard, Gill R&D provides embedded software and systems integration support. Raise non-standard requirements before the specification is locked, not after the hardware has been delivered.

WindObserver is constructed from 316 grade stainless steel specifically for long-term marine deployment. Rated to IP66, operates across −30°C to +70°C, and available with a high-power heating option for operation in icing conditions. No scheduled maintenance requirement from normal operation.

WindSonic shares the same no-maintenance design in a more compact form factor, and has been proven in service through wave heights exceeding 20 metres on deployed buoy networks. Both sensors are designed for fit-and-forget installation in remote or offshore locations where access is infrequent by design, not by accident.

Yes. LevelDefend sensors are custom-engineered for military marine craft and naval USV programmes, built to DEF STAN and MIL STD shock and vibration standards. WindObserver IS is certified for ATEX, IECEx and UKEX hazardous area installation. WindUltra was designed for unmanned vehicles and tested to IP69k including shock and vibration profiles relevant to military platform requirements.

Defence and naval programme enquiries are handled directly by Gill's specialist team. Specific interface requirements, connector formats and classification standards are best discussed at the earliest possible stage.

For standard deployments, none from normal operation. All Gill wind and level sensors are solid-state with no moving parts. No mechanical components to wear, no calibration intervals triggered by moving part degradation, no consumables to replace. LevelLite and LevelPro are sealed to IP68 with no maintenance requirements across their service life.

For uncrewed platforms operating extended missions without crew intervention, this is not a convenience feature. It is a fundamental requirement of autonomous operation. A sensor that needs a maintenance visit on a schedule is incompatible with the USV mission profile.

They solve different problems in the same environment. WindObserver is the precision marine anemometer for demanding and critical applications: dynamic positioning, naval vessels, commercial marine, offshore hazardous areas. It is the specification when approval credentials, stainless steel construction and safety-critical integration are the brief.

WindUltra is Gill's most compact anemometer, designed from the ground up for unmanned vehicles where platform size, weight budget and survivability are the constraints. If the platform is a USV, UAV or any uncrewed vehicle where space is limited and conditions are not, WindUltra is the starting point.

WindSonic is the right choice for fixed buoys, remote monitoring networks and long-range unattended deployments where cost, low power draw and fit-and-forget reliability are the primary requirements. It is not the sensor for a moving autonomous platform. It is the sensor for a static one operating far from a service team for a long time.

Yes. Gill Group combines Gill Instruments, Gill Sensors and Controls, Gill R&D and Labcal into a single UK supplier relationship. Wind measurement, liquid level sensing, position sensing, custom embedded systems development and UKAS-accredited calibration are all available from one group.

For USV programmes that need a sensor package rather than individual components, Gill can work from platform requirements through to a complete specification. If consolidating your sensor supply chain matters for programme management, contract simplicity or UK sovereign supply requirements, it is worth starting with a single conversation.

WindObserver operates across −30°C to +70°C as standard and is available with a high-power heating option for operation in icing conditions. The ultrasonic measurement principle means there are no moving parts to freeze, seize or accumulate ice in ways that affect measurement accuracy.

WindUltra has been tested to altitude and extreme temperature profiles appropriate to unmanned vehicle applications. For polar or cold-climate programme requirements outside the standard operating envelope, contact Gill directly with the specific temperature range, icing risk assessment and platform type.