You can start this Wherigo where ever you want.
Your goal is a zone out on the fjord. Here you will get the coordinates for the cache. But on which side of the fjord is it?
The ferry passes this zone so you can travel with it to solve this wherigo. If you have your own boat thats ok to.
If you don't bring your car it is free to go with the ferry.
Download cartridge here : http://www.wherigo.com/cartridge/details.aspx?CGUID=e8a53482-a0e2-4dac-bc6d-889835c9ab01