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C-DRONE GUIDE · 2 AUGUST 2026

Tethered drone: continuous site or event surveillance, principle, regulations, price

A standard open-category drone stays airborne for twenty to thirty minutes per battery — plenty for a one-off mission, but a poor fit for a need to keep watch continuously over several hours: a security post for a large event, an industrial platform in a sensitive phase, a mobile command post during a crisis-management operation. The tethered drone answers exactly that need: linked to the ground by a cable that powers it continuously, it holds a fixed hovering position for as long as required, without ever landing to recharge. Here is how it works, the particular regulatory status it benefits from, its professional use cases and the prices observed in 2026.

Published on 2 August 2026, reviewed on 4 August 2026 — regulations in force as of August 2026.

The principle: a camera in the sky, with no battery limit

A tethered drone stays permanently connected to the ground by a cable that serves two purposes: power supply, which gives it unlimited flight endurance for as long as the ground source (mains power or a generator) keeps running, and often video transmission, more stable than a standard radio link over long durations. The ground station can be a simple fixed post set up on a site, or mounted on a vehicle moving slowly — a security van on a slow patrol around a perimeter, for instance.

The difference from an autonomous drone-in-a-box is clear: that system takes off in cycles from a charging station, patrols, then lands, leaving blind spots between flights. A tethered drone, by contrast, takes off only once and holds a fixed position continuously — a permanent overview rather than a series of passes.

A separate regulatory status: the tethered-aircraft exemption

Commission Implementing Regulation (EU) 2019/947, which underpins the open, specific and certified categories that apply to "free-flying" drones in France as across the rest of the Union, sets aside a distinct treatment for tethered unmanned aircraft: as long as a physical retention device (the cable) prevents the aircraft from moving beyond a fixed distance, it escapes the operational requirements of those three categories. Height is then no longer capped by a general rule such as the open category's 120 m, but bounded solely by the length of the cable — see our guide to the open versus specific drone category for the framework that applies to "free" flights.

This exemption does not do away with common sense or ordinary law: a ground safety perimeter around the anchor point, marking if the aircraft rises near an aerodrome, and a check of local restrictions on the Géoportail map remain necessary for any serious professional mission. A provider operating a tethered drone commercially also keeps every reason to stay registered as an operator and to cover the activity with professional civil liability insurance: the lighter touch applies to the flight's operational formalities, not to the operator's liability towards clients or third parties.

Use cases: events, site security, crisis management

The clearest use case is events: a corporate gathering, an outdoor trade show, an official visit or a sports event all call for a permanent overview of the security perimeter, not occasional passes — see our guide to drones at a festival or public gathering for the rules on flying over crowds. On a construction site or industrial site going through a sensitive phase (delivery of high-value equipment, a period at risk of theft), a tethered drone offers an alternative to investing in a permanent autonomous station — our guide to construction-site surveillance against equipment theft covers the other approach, scheduled patrols.

A third field of use: a mobile command post during a drill or a real crisis-management operation for a local authority — flooding, a forest fire, a high-risk gathering — where a continuous, stable aerial view beats a series of short flights (see our guide to the municipal emergency plan). A study published in 2026 in the journal Drones by the GATV team at Universidad Politécnica de Madrid illustrates how mature this principle has become: it describes a tethered drone system mounted on a maritime platform, paired with AI-based detection (YOLOv8m and BoT-SORT models) for continuous vessel tracking in a port, with flight endurance tested up to 50 hours (see the study on Google Scholar). The principle — a fixed, continuous aerial view, increasingly AI-assisted — transposes directly to a land-based, industrial or event perimeter.

Technical limits and price

A tethered drone remains a fixed-post tool: the length of the cable bounds both the height and the useful radius, with the aircraft staying directly above its anchor point — it does not replace a standard flight for covering a long route or following a moving subject. The ground station must be stable (a vehicle, a trailer, a fixed mast) and have a reliable power supply, and strong wind puts strain on the cable just as it would on any drone flight. It is a complement to one-off missions, not a substitute: the right question to ask a provider is about the actual need — extended fixed-point surveillance, or mobile coverage of a site.

Orders of magnitude observed in France in 2026 (excl. VAT):

This service falls under our drone security and surveillance offering; request a quote stating the desired coverage duration, the useful height and the power supply available on site.

Frequently asked questions

Does a tethered drone replace a standard drone?

No, it complements it. A standard drone covers long routes, follows a moving subject or carries out a one-off mission lasting a few minutes; a tethered drone holds a fixed position continuously for hours, which no battery allows. The choice depends on the need: mobile coverage or extended fixed-point surveillance.

Is a remote pilot certificate still needed?

The regulatory exemption concerns the operational formalities of the open, specific and certified categories, not the competence expected of the operator. For a serious professional service, a trained and insured remote pilot able to manage the anchor point, the weather and the ground safety perimeter remains the safer choice.

How high can a tethered drone fly?

That depends solely on the length of cable installed, typically from a few dozen metres to a little over a hundred depending on the equipment: unlike a free flight capped by a general rule, the useful height is set case by case with the provider according to the site and the coverage needed.

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Put it into practice

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