"We concentrated everything on technology and on sailing," he said Friday.

The game's most common criticism is the heavy emphasis on sailing.

He was a keen yachtsman, and wrote several books on sailing.

He has published the following books on traveling and sailing:

He was very keen on sailing and made several long ocean voyages.

More than 70 percent of the Sea Sense courses concentrate on sailing.

Even today, the folk tales of northern Germany have a unique focus on the sea and sailing.

Advanced training focus on competitive sailing and race organization.

His works also include several technical how-to books on sailing and ocean cruising.

A 60-hour return for a 4.5 metre car and two adults costs from £50 to £89, depending on sailing.