I don't know that there is any
real evidence for Viking presence in the Pacific at all.

Yeah but the Vikings were not known for leaving a lot evidence for any
of the places they went. Many of the places they visited we know
about from the original inhabitants accounts. We know they went to
the middle east but don't see a lot of evidence there. We know they
came to N.A. and have very limited evidence there. It's not Spanish
or English explorers that really want everyone to know they were
there. Also, and I'm not disputing the book here but, carbon dating
is a tricky thing especially when dealing with sample that has been
submerged for hundreds of years. There are a lot of factors that can
make the sample appear much older or much younger than it really is by
hundreds of years.