Dublin Bay Sailing Club, Dun Laoghaire Motor Yacht Club, National Yacht Club, Royal Alfred Yacht Club
Royal Irish Yacht Club and Royal St George Yacht Club. are also concerned about access to the water if a proposed 'pedestrian walkway' in front of the waterfront clubs was completed.
The clubs have engaged 'professional help' to prepare a submission to outine the concerns.
Also seen as a problem is the 'lack of sufficient facilities in the masterplan for hosting significant international sailing events'.
A survey in 2009 by the Irish Marine Federation (IMF) calculated a €3million spend by participants connected with the 500-boat Volvo Dun Laoghaire regatta. The clubs have previously stated they see the harbour's future as a leisure facility.
A masterplan model was on display by the Harbour Company in the month of August.
Writing to members in the current edition of the National Yacht Club's newsletter commodore Paul Barrington says the clubs 'hope to further engage with the harbour [company] to find a mutually acceptable way forward'.