The Eastern Division consists of six clubs based in Langstone Harbour:
- Andrew Simpsons Watersports (Portsmouth) is based at the north western edge of the harbour.
- Eastney Cruising Association is based at the mouth of the harbour on the Portsmoth side.
- Hayling Ferry Sailing Club is based at the mouth of the harbour on the Hayling side.
- Langstone Sailing Club is based at the join of Langstone and Chichester Harbours.
- Locks Sailing Club is based at the south western edge of the harbour.
- Tudor Sailing Club is based at the north western edge of the harbour.