By car: Tomnahurich Bridge is just 1.5 miles from the centre of Inverness. Follow signs for the A82 Fort William. This will take you along Glenurquhart Road (look out for the Highland Council offices on your left).
The entrance to Jacobite's offices, where the boat leaves from is a small turning on the left hand side just as you finish crossing the Caledonain Canal Bridge.
By foot: if you're walking from the city centre it should take you about 30 minutes. It's a lovely walk along the River Ness but don't forget you'll need to turn away from the river and heads towards the Aquadome and the Floral Hall both of which are well sign posted.