Nauticalia

This is the first and only portable wind instrument with the ability to calculate direction as well as speed - it has a built-in digital compass. It was designed for the emergency services but has obvious uses for sailing and outdoor pursuits in general.

Other functions include: maximum speed memory, cross and head/tail readings, temperature, windchill and compass.

The closed case measures 4x1.5" and is water, shock, dust and vibration resistant.