Multi-Operator Drone Projects in the UK: Coordinating Shared Airspace and Joint Operations

When Multi-Operator Coordination Is Needed

Multi-operator drone projects arise in a variety of commercial contexts across the UK. Large construction sites may have separate survey, inspection and monitoring teams flying simultaneously. Film and television productions often involve multiple drone units. Emergency response scenarios may see police, fire and ambulance drone teams operating in close proximity.

The CAA does not have a single regulation dedicated to multi-operator coordination, but the general duty of care under the ANO 2016 and the requirements of CAP 722 apply to every operator individually. When two or more operators share airspace, additional planning and communication measures become essential.

Appointing a Lead Operator

For any project involving multiple drone operators, appointing a lead operator is considered best practice and is strongly recommended by CAA guidance. The lead operator does not assume legal liability for other operators, but takes responsibility for overall airspace coordination.

The lead operator should:

• Establish a single coordination plan covering all drone operations on site
• Define geographic and altitude boundaries for each operator (vertical and horizontal deconfliction)
• Set communication protocols — typically a shared radio frequency or designated communication channel
• Manage the sequencing of flights to prevent simultaneous operations in overlapping areas
• Coordinate with local air traffic control (ATC) if operating near controlled airspace or aerodromes
• Brief all operators before operations commence and conduct post-operation debriefs

Airspace Deconfliction Methods

Deconfliction is the process of ensuring that multiple drones do not occupy the same airspace at the same time. For multi-operator projects, the most common methods are:

Geographic Segregation

Each operator is assigned a defined geographic area within the overall project site. Boundaries are marked on a shared map and communicated to all parties. No operator flies into another team's designated zone without explicit permission from the lead operator.

Temporal Segregation

Operators are assigned specific time slots for their flights. Only one operator is airborne at any given time. This is the simplest method but reduces overall operational efficiency for large projects with tight timelines.

Altitude Separation

Different operators are assigned different altitude bands. For example, one team may operate at 0-30 metres while another operates at 40-60 metres. This requires reliable altitude measurement and clear briefing on altitude limitations.

Combined Approach

Most real-world multi-operator projects use a combination of geographic, temporal and altitude separation, tailored to the specific site conditions and operational requirements.

NOTAM Procedures

A Notice to Airmen (NOTAM) warns other airspace users about drone activity in a specific area. For multi-operator projects, a single NOTAM should be issued by the lead operator covering the entire project area and duration, rather than each operator issuing separate NOTAMs for overlapping locations.

NOTAMs for drone operations in the UK are requested through NATS Aeronautical Information Service. The lead operator should submit the request with sufficient notice — typically at least 48 hours before operations begin — specifying the geographic boundaries, maximum altitude, dates and times of operations.

Insurance and Liability

Each operator in a multi-operator project must hold their own valid third-party liability insurance as required by retained EC Regulation 785/2004. The lead operator's coordination role does not transfer liability. If an incident occurs, the operator whose aircraft was involved bears primary responsibility.

For large-scale projects, the client commissioning the work may require additional insurance coverage, potentially including professional indemnity and public liability policies that cover the overall project rather than individual flights.

Communication Protocols

Clear communication is the foundation of safe multi-operator operations. All operators should agree on the following before flights begin:

• A primary communication channel (VHF radio, PMR446 or digital communication system)
• Standard phraseology for take-off, landing, emergency and cease-operations calls
• A designated frequency or channel that is monitored continuously during operations
• A procedure for declaring an emergency that all teams recognise and respond to immediately

Documentation Requirements

The lead operator should compile and maintain a coordination document that includes all operator details (names, operator IDs, insurance policy numbers), the agreed deconfliction plan, communication protocols, emergency procedures and site-specific risk assessments. Each operator should retain a copy for their own records.

After the project concludes, each operator should file their own flight logs. The lead operator should retain the overall coordination plan for at least two years as part of their operations records.

Checklist for Multi-Operator Projects

• Appoint a lead operator with clear coordination responsibilities
• Verify all operators hold valid registrations, insurance and any required Operational Authorisations
• Establish geographic, temporal or altitude deconfliction for all operations
• Issue a single NOTAM covering the entire project area and duration
• Agree communication protocols and test them before operations begin
• Conduct a joint briefing before the first flight and debriefs at the end of each operating day