The Duyfken replica, training ship Leeuwin and a Svitzer tug will be open for locals to have a walk through.
Free boat rides around the inner-harbour will be on offer all day.
The Royal Australian Navy and James Fisher Submarine Rescue Service will also be involved, while the Maritime Museum will be open for a gold coin donation.
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READ NOWFor the first time in the event’s history, there will be a demonstration of mobile X-ray and detection units from the Australia Border Force.
The Fremantle Ports’ Maritime Day is on October 31 from 10am to 4pm at Victoria Quay.