The Northney Marina Slipway sits on Sweare Deep, on the north shore of Hayling Island within Chichester Harbour. It is part of the wider Northney Marina complex and provides boat launching access to the deep-water channel and the broader harbour beyond.

By water, the slipway is reached by heading north up Emsworth Channel to the Emsworth south cardinal beacon, then forking to port up Sweare Deep. The marina's access channel is dredged and available around the clock.

By road, the site is on Northney Road, Hayling Island. The slipway is suitable for small trailered craft including inflatables, with trailer parking available within the marina grounds as part of the launch fee.

Launching fees apply; contact the marina directly for current rates.