Crowley Maritime is sending the second of its big new 10,192 hp Prince William Sound class tanker escort tugs, Tan'erliq, north to Alaska this month. It will be following in the wake of the first boat, Nanuq, which went north earlier this year. Both vessels have been designed with cold weather and rough seas in mind, and each features an innovative new deck heating system. "We were looking for new and innovative technology," said Maynard Willms, vice-president of Vessel Management Services, Inc (VMS), the Crowley subsidiary charged with designing and overseeing construction of the new tugs. According to Willms, after two years of searching…