Yes, no problem as others say. Not like
spain where the
marinas don't like people
anchoring outside and sometimes come out demanding money!
BUT
The marseilles area is well known for being occassionally windy - the
books say 200days a year the
wind blows F6 or more, so listen to forecasts, usually directed to them from ch16. The seas can be very short and chopy, pretty nasty (usually from NW there) so need to choose the right spot to tuck right in. The drill seems to be to get into the marina, ask questiosn later.
Don't expect any response from
marinas, etc between 12.30 and 2.30, really. It's seen as a bit rude to interrupt lunch unless a real argh
medical emergency.
The yellow buoys (if present) mark the inner limit from sea where you can anchor. To go ashore use the channels up to the beach.
PS I found Grande Motte marina to be v v helpful, a guided tour of the facilities as i arrived, amazing. No prob just hoiking up (yes, i was in a
catamaran as well) but it's al pretty relaxed all the way along, really.