Step aboard a high speed rib for what will be a tour like no other with speeds approaching 50mph youll experience the exhilaration of surging across the waves and seeing the sights of portsmouths famous harbour youll see the historic harbour and naval docks followed by a scenic blast around the napoleonic forts and in the distance youll see the spinnaker tower this tower soars over the whole of gunwharf quays and youll take a visit to the top viewing platform 170 metres high from up he