Fortunately, for we FS Navigator users with FS 2000, FS 2002, and FS2004, the float plane bases appear as a different symbol to the land based airfields on the GPS map, and are easily identified....

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Try "Commodore Centre" in San Francisco Bay, close to Golden Gate bridge, or "Lost Isle" just up the Sacramento River.
Paul... 8-)...!
Note: FS Navigator is not yet released for FSX...(Maybe later, in 2007).
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.