a very good analogy of diver's watch and an SUV.

A dive watch is a wrist instrument that has a unidirectional bezel that provides divers with an alternative source of elapsed time for the current dive. A suitable dive computer should be the primary source for this information. That said, the dive watch style is very popular among watch aficionados that do not even dive, such as myself. To me it is just like the SUV in the automobile industry. Most owners’ will never take them off-road but love the fact that they can should they choose to. Personally I love the fact that my watch can go places I can only dream of.