Local and Olympic authorities have been keen to point out that no final decisions have yet been made over the proposed harbour revision order.

Coastguard district operations manager Mark Rodaway, who was at the meeting to discuss the proposed harbour order, said: “Water quality is an issue that is going to be closely looked at.

“Safety aspects, such as people leaving moored yachts on tenders to come ashore, are also going to be looked at.

“It’s important to remember these are a first draft of the plans and they can still be modified to mitigate people’s concerns.

“There’s a whole consultation process still to go through.”

A London 2012 spokesman said: “Partners are at the early stages of putting together the best possible plan for managing the water at Games time. More details and discussions will follow later this year once the optimum plan is in place and can be shared in full with the users of the water and the wider community.”

Peter Farrell, chairman of the Weymouth Harbour Board, said: “Weymouth Harbour Authority and Portland Harbour Authority have had an initial informal discussion with their Harbour User Consultative Groups.

“The two port authorities will be working with LOCOG, Dorset Police and the Coastguard to develop plans to manage the waters of Weymouth Bay and Portland Harbour during the period of the Games.

“These plans are currently at an early stage and will include a wide range of issues such as operational protocols, safe navigation, access to harbours and environmental risks. As the plans are developed they will be shared with interested parties at a series of events which are currently in the process of being programmed.”