Misc: What device was used to determine a ship's latitude?

Questions

Who were Huey Lewis's backing group?

Which girl did Pink Floyd "See play" on an early 60's single?

Which British island, about 80 feet across, is in the Atlantic, 230 miles west of the Hebrides?

What was supposed to flow in the veins of the Greek Gods?

In which film did POWs use a avulting horse to disguise the digging of an escape tunnel?