Ok guys, Im from Christchurch and i use the harbour most weekends. However, im currently at Nottingham Univercity (studying Geography). Any questions ask away.
For non locals I would recommend you enter the harbour on or around high tide. You WILL NOT get in or out at low tide, unless you walk it!
At the harbour entrance there are several sets of port and starboard channel markers, the speedlimt here is 8 knots but I would stay slow. It is best to stay closer to Mudeford Quay on the way up 'the run' but watch out for fishing lines.
The channel markers are continued up the harbour and to the river stour, you should be alrite for depth during high tide. The speed limit in the harbour is 4 knots, don't be tempted to 'plane it' the marine patrol come out of nowhere, although they finish at 5:30pm, u didn't here it from me
It takes around 35 minutes from the harbour entrance up to the top of the harbour and the river stour.
There is no water side refueling for petrol in christchurch, but I can give you directions to a Texico which is almost riverside.
I can highly recommend a visit to Christchurch and although everyone says its really tidel and you can get stuck in there I have be known the enter the run at low springs and launch/ recover my boat at low tide, oh and my prop is mint!
any questions just ask away,