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Cooled vs. Uncooled FLIR Thermal Cameras – Differences in Performance and Range
Digital Skipper |3/06, 2025
Learn why cooled thermal cameras like the FLIR M500 provide twice the detection range and superior image quality compared to uncooled models like the M400 – for safe navigation and SAR.
Not all thermal cameras are created equal. Sensor resolution, lens size, and whether the camera is cooled or uncooled affect the sharpness and range of the image.
Thermal imaging technology for increased safety and navigation
Thermal imaging technology has long been an indispensable tool for improved situational awareness at sea. The ability to detect ships, objects and body heat in total darkness – and through fog or smoke – makes navigation safer 24/7.
For professional captains and authorities, 360-degree visibility is a crucial advantage. The earlier you can detect and assess an approaching vessel's intentions, the more time you have to act. That's why long-range detection is one of the most powerful features on board.
Cooled vs. uncooled cameras – difference in range
The FLIR M500 delivers twice the image quality of uncooled thermal cameras thanks to a helium-cooled sensor system . These cooled Mid-Wave Infrared (MWIR) sensors use the same technology as advanced military systems and outperform uncooled Long-Wave Infrared (LWIR) sensors in fog and haze.
The cooling system lowers the sensor temperature to -233°C , reducing thermal noise to a level below the scene's own temperature. The result is an extremely sensitive and sharp image – perfect for long-range detection.
FLIR M500 (cooled)
- Small vessel detection: up to 8 nautical miles
- Classification of activity on board: up to 2 nautical miles
FLIR M400 (uncooled)
- Detection: about 3.5 nautical miles
- Classification: approx. 1 nautical mile
The difference is dramatic – cooled systems provide twice the range and better detail.
Benefits of cooled thermal technology
Cooled thermal cameras are invaluable for:
- Search & Rescue (SAR) – faster detection of people in the water
- Security measures – maintain a safe distance from potential threats
- Navigation in difficult conditions – fog, haze and darkness
With cooled technology, you get longer reaction times and better decision-making in critical situations.
Summary
Whether you choose a cost-effective uncooled camera for shorter distances or a cooled camera for maximum performance, FLIR Marine thermal cameras provide superior visibility, increased safety and reliable detection – day or night .