There are two different radios in use, currently they are all PMR446; ie. they use the 446MHz public licence free frequency.  The operating instructions for each type  are in the links below, click to view.
Cobra 1035FLT 
 

Cobra Radios

These radios have been in service since October 2020
The Cobra radios float and have good coverage.

 See the Operating Instructions

  

 

Uniden PMR446 set
 
Uniden Radios

There are only two of these which were bought as an experiment.  They float and are waterproof but the audio volume output is not that loud.

See the Operating Instructions

 

 

 

Dutyman Racing & Training Rota