Iceland Whale Watching Express tour from Dalvik close to Akureyri, just below arctic circle is a great locationfor whale watching. The tour they suggests takes1.5 hour lwith excellent opportunity to see beautiful humpback whales (100% success 2017) or other whale species.
One goes silent in the presence of beauty.
The maximum speed on the tour is 80 kmh or 42 knots but normally they drive on 60 kmh or 32 knots. They use a Ring Rigid Inflatable boat or RIB.
More info here.