have a look at www.littlehamptonport.co.uk
here you will find all info as to the tides at Littlehampton.
Nice place Littlehampton and you will find the Arun View pub a good place to eat or you could venture up the river passed Arundel castle and have a meal at the Black Rabbit , mind you not the best place for mooring
yes you are correct about the the harbour entrance cos at low tide it dries out to even 1.9 mtr
whatever keep well away from Selsy Bill, best from Nab Tower head for Outter Ower then Littlehampton and watch out for the lobster pods on the way a lot between Bognor Regis and Littlehampton
about time you guys from the Solent area came our way
PS you can get fuel at the Littlehampton marina