This multi begins at Weymouth and ends at Bellingham. To get there you have two options; cross Pipers River or drive 29km. If you come at low tide you can basically just walk across the sand and only have to wade in water up to your knees in one small part of the crossing. You could also bring a kayak or boat and cross at high tide. Make sure you don't spend too much time over the river so the water doesn't get too high or too low to walk or boat back.
At WP1 is a telegraph pole. On the pole are two plates with numbers on them. The top plate has six digits and the bottom plate has three.
Find these numbers and find the value of ABCDEF (the top six digits in order) and GHI (the bottom three digits in order).
The cache can be found at: South 41 EG.EI(C-A) East 147 E(C+H).(I+D)(F+D)(B+G).
Happy caching!