5.3 External Aid to Competitors

The following limitations are imposed so that the competition shall, as far as possible, be directly between the individual competitors, neither controlled nor helped by external aid.

5.3.1 Radio Transmitters and Transceivers Radios are for voice transmissions between team members and between them and the Organisers only.

a. They may not be used to contact Air Traffic Services other than for obtaining permission from an airfield to land on it, unless the Organisers add specific requirements in the Local Procedures.

b. Any other data transmission between competitors, or between them and the ground, except as required by the Organisers, is prohibited.

c. Transmissions may only be made on frequencies prescribed by the Organisers.

d. The Local Procedures shall designate common radio frequencies that shall always be used by competitors for flight safety.

A single frequency should be designated for the launch, start, finish, and landing. One frequency should be designated for each Class flying within a common task area.

To improve safety, competitors should maintain a listening watch on the designated frequencies, especially during the launch, prior to starting, while finishing and landing, and when thermalling with other sailplanes.

5.3.2 Other Types of Aid Leading, guiding, or help in finding lift by any noncompeting aircraft is prohibited. Competing sailplanes abandoning their task or still airborne after cancellation of their task must land or return to the competition site
without delay and may not lead, guide or help in any way competitors in other classes still flying their assigned task.