Littlehampton Marina sits on the west bank of the River Arun, in an area long associated with wharves, boatyards, and marine businesses. Access for masted craft and vessels under pilotage is provided via a retractable footbridge with 4.

2 metres of clearance at Mean High Water Springs, opened by prior request to the Harbour Office.

The marina operates a tractor-assisted boat launch service from its slipway, though launches are generally avoided within two hours either side of low tide due to tidal conditions.

All vessels using harbour facilities must register with the Harbour Office and pay harbour dues before going afloat.