http://www.mast.tas.gov.au/domino/mast/mastweb.nsf/v-lu-all/Publications~Denison+Canal+-+Transit+Information?OpenDocument

This looks very good - although the silly authorities say it must not be used for navigation.

Have someone stand up front with polaroid sunnies on, looking out for any hazards as you slowly motor through. Hand signal's back to the helmsman.

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Chinaman's Bay/Cove at Maria Island reputedly has flathead. Trolling over sand next to the weed can be good.

Thanks for the tips guys.
We made it through the denison canal and marion narrows. I went into the canal with the tide flowing into blackmans. I can see what you mean about keeping the steerage when going through the gap at the bridge was interesting. I dont know what the hype was about marion narrows, crossed it one hour before top of tide with no issues.
Anchored in Encampment Cove at Maria Island which had good protection form the NW. Fishing was good with plenty of flathead and a couple of australian salmon and a two gummies. We are now stuck in Triabunna with the WNW winds tassie is currently experiencing

Im tied up at the seafish tasmania wharf about 5km out of town. Rang the pub "spring Bay Hotel" (near the wharf in town) to enquire about the local taxi service. There was none, however the publican organised a local fisherman to pick me up on his way to town, and the publican got one of the locals to mind the bar and ran me back himself after a meal... I'd say its changed hands :)