Poole Harbour is a busy expanse of water used by sailors, canoeists and paddle-boarders; Studland Bay is a marine conservation zone facing popular, family-friendly beaches.  Jetskis are noisy and polluting and totally out of keeping in this natural landscape.  The enjoyment that their riders have comes at the expense of the very many more people hoping to experience the tranquility of nature. Restricting the times that jetskis can be launched and their proximity to beaches would ensure everyone's enjoyment.