An old navigational tool of yore, the Sundial Compass
is two instruments in one.  Beneath the glass is a 
working compass, guaranteed to point north.

Flip up the sundial, and you'll know what time it is.
This tool was used as an ancient technique for determining 
longitude.

If you know what time the sunsets via Greenich Mean Time,
then calculate the difference in minutes of the sunset before
you.

Considering it takes the sun an hour to travel 500 miles,
a sailor can determine how far away he is from GMT, thus 
what longitude course he sails.

The compass and sundial are housed inside a protective
metal container and come in a decorative box.  The compass
sundial is approximately three inches in diameter.