Leave Kaikoura, follow the SH1 to north. After 20km there is a snack bar on the right side of the road. It is called "Nins Bin". You can park there. The boat is located at the left side of the road. You have to cross the railway and some scub to get close to the wreck.
GPS: -42.264856,173.80635
Camera Model: NIKON D70
Lens: Tokina 12-24mm 1:4 DX
Focal Length: 12.00 mm
Focal Length (35mm Equiv): 18 mm
Exposure Time: 1/3200 sec
F-Number: f/4
Shooting mode: Aperture priority
Exposure bias: -2/3 EV
Flash: No
ISO: 200
Image at flickr, large version