Originally Posted by BassBoy
Though the Aldernay race can be nasty (avoid wind against tide), Cap de la Hague can be VERY nasty even in fairly benign weather.
I would therefore be tempted not to go from Cherbourg, but from further south on the Cotentin.
I have not done this trip in a RIB but have sailed it many times. I would second the comment re. the conditions at Cap de la Hague. I would recommend not going direct along the coast and across the top of the Race.
Instead, take a parabolic route (is that the right word?) from Cherbourg. So, head more out to sea and arc round into Braye Harbour. That way you should avoid any lumpiness off Cap de la Hague and at the head of the Race. Keep a close eye out for Lobster pots as you approach Alderney in case they are being dragged under.
If, on the other hand the weather is settled, I would be happy to whizz straight across the top of Race.