Hullo roycv
The largest model marine club in Sydney is the St George Model Boat Club .......
SSMBC meet at Scarborough Park, Barton Street Monterey each Sunday morning .......their meeting ground/lake is literally a 10 minute drive south from Mascot airport where you will be arriving & naturally as you know, the Gosford/Woy Woy area is about 50 minutes north of Sydney by car [depending on the traffic
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I will get their WEB site detail for you....[I am not yet a member]....... I will be interstate [Adelaide] for approx. 3 weeks this coming May..................
We have a few Mayhem members on the eastern seaboard of NSW so hopefully another may also be in contact.......I hope you enjoy your visit to OZ......Derek
Here is an image from Flight Tracker ,,,,[the PC mouse hand is located on Monterey] you can see the proximity to Mascot, although GOOGLE earth will provide the same........