Western Isles is a 48.9 m / 160′6″ luxury motor yacht. She was built by Ishikawajima-Harima in 1974.
With a beam of 7.8 m and a draft of 2.7 m, she has a steel hull and steel superstructure. This adds up to a gross tonnage of 366 tons.
She is powered by Daihatsu engines of 750 hp each giving her a maximum speed of 12 knots and a cruising speed of 10 knots. Western Isles's maximum range is estimated at 8000 nautical miles.
The motor yacht can accommodate 14 guests in 7 cabins. The yacht was designed by HYS.