The East Anglian coast is defined by its sandbanks — extensive, shifting bodies of sand that reduce the navigable channels to narrow corridors that must be followed precisely. Several of the most interesting harbours on this coast are accessible only for a few hours either side of high water; some dry completely. The Norfolk Broads add a further dimension: inland waterways with fixed bridge clearances that limit the mast height of anything that ventures beyond the tidal limit.
The Offshore Banks
The East Anglian coast from Harwich north to Cromer is fronted by a complex system of offshore banks — the Shipwash, Sunk, Galloper, and Outer Gabbard to the south; the Haisborough Sand, Ower Bank, and Sheringham Shoal to the north. These are not rocks but soft sand, and the channels between them carry commercial shipping north and south. The inshore channels (inside the banks) offer a more sheltered passage for yachts but require accurate pilotage and up-to-date charts — the banks shift after every major storm. Use the Admiralty folio SC5607 (approaches to the Thames) and SC5614 (East Coast — Tyne to Harwich) as the basis, supplemented by a current edition of the East Coast pilot.
Bar Harbour Entrances
Wells-next-the-Sea, Brancaster, and Burnham Overy Staithe all have bar entrances that are navigable only for a limited period around high water. Wells: the approach channel has been re-marked after the 2023 storm season; consult the harbourmaster (VHF 12) before entry. The bob (the visitor mooring area) is accessible for 2.5 hours either side of high water for a 1.5m draught vessel. Brancaster Staithe: shallow — not suitable for keel boats with draught over 0.8m.
The Norfolk Broads
The Broads are accessible from the sea via the rivers Yare (through Great Yarmouth), Waveney (through Lowestoft via Lake Lothing), and Bure (through Great Yarmouth via Breydon Water). The critical limitation is bridge air clearance: Potter Heigham bridge (River Thurne) has a clearance of 2.4m at normal water level — almost all masted vessels are excluded from the upper reaches of the Thurne. The Broads Authority publishes a table of bridge clearances. Hire boats on the Broads are purpose-built for the waterway; if you want to explore beyond the lower rivers, a Broads hire boat is the practical option.
Key Harbours: Entry Notes
Harwich/Ipswich: deep water, well marked, busy commercial port. Ipswich is 10 miles up the River Orwell — tide-dependent above Pin Mill, dries to soft mud on the edges. Woodbridge: access via the Deben river; bar has minimum 0.4m at LWS in the main channel but shifts after storms. Call Felixstowe Ferry (the bar pilot service) on VHF 8 for bar conditions. Blakeney: tidal harbour with an outer approach channel of 1.5m at LWS in the main line — contact the harbourmaster (mobile number posted at the quay).
Frequently Asked Questions
Q: Are the East Anglian sandbanks dangerous at night?
A: In calm conditions with GPS and up-to-date charts, the inshore channels are passable at night by experienced navigators. In any sea state, the sandbanks produce short, steep breaking seas without warning — do not cut corners on bank edges in the dark. The channels are well lit and there are many anchorages in which to stop and wait for daylight. Night passages in this area should be in the main offshore route, not the inshore channels.
Q: What is Breydon Water and why does it matter?
A: Breydon Water is a large tidal estuary immediately west of Great Yarmouth that is the gateway to the majority of the northern Broads (Rivers Bure, Thurne, and Waveney). It dries extensively at low water; the navigable channel is marked by posts but is narrow and changes with the tide. Crossing Breydon is best done on a rising tide — aim to arrive at the eastern end (Haven Bridge at Yarmouth) 2 hours before high water, which gives you a full flood tide to cross and reach Acle or Reedham before the ebb.