Marine Traffic has new owners and the plug-in we used no longer works. Until this can be fixed, please use their site directly, which is at Digimap continues to provide information to Marine Traffic for the whole of the Bay of Saint Malo area, and we hope that is of assistance with your boating.

Approx Distances from Guernsey:

  • Alderney 23nm
  • St Helier 26nm
  • Dielette 28nm
  • Carteret 31nm (30nm to channel entrance)
  • Cherbourg 44nm
  • Lezardrieux 47nm (43 nm to entrance to river)
  • Paimpol 48nm (45nm to entrance to passage)
  • Treguier 50nm (44nm to entrance to river)
  • Saint Quay 51nm
  • Saint Cast 51nm
  • Perros Guirec 53nm
  • Saint Malo 54nm
  • Ploumanach 54nm
  • Pontrieux 54nm (8nm upstream of Lezardrieux)
  • Granville 55nm
  • Binic 55nm
  • Dahouet 57nm
  • Trebeurden 63nm
  • Dartmouth 70nm
  • Weymouth 71nm
  • Portland 73nm
  • Torbay 75nm
  • Roscoff 75nm
  • Plymouth 89nm
  • Portsmouth 99nm
  • L’Aber Wrac’h 104nm

Useful French nautical terms –…


The French tend to use “coefficient” to highlight the range of the tide. Essentially this is a percentage.

  • 70% is an average tide
  • 95% is an average (mean) spring tide
  • 45% us an average (mean) neap tide

The coefficient can vary between 20 and 120. The higher the coefficient, the larger the tidal range.
Tides above 85 are called spring tides and below 55 are called neap tides.


This is a useful, official site –

Please call the marinas direct if you wish to find out how busy they are. Nearly all the Brittany and Normandy marinas DO NOT take reservations and so beware of 3rd party sites offering bookings. 

Before you visit a marina, have a look at the YouTube channel to familiarise yourself with some of the marinas –…

If you have a Princess V39, V40 or indeed any Princess V Class, or know someone who does, please send them a link to the Facebook group