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Speed can be dangerous on the water. Not only is there a risk of crashing into other vessels, land or navigation aids, there are many other obstacles such as swimmers and divers or obstructions hidden under the surface. Always maintain a good lookout and operate at a safe speed and check local speed restrictions before you leave. A maximum speed of 5 knots applies on Port Phillip when operating a vessel:
- Within 50m of swimmers, other vessels and fixed or floating structures.
- Within 100m of divers flags.
- Within 200m of waters edge in coastal and enclosed waters. Greater speed limit distances are in place along the shallower Mornington Peninsula bay beaches.