Navigability n. : The quality or condition of being navigable; navigableness.

Example:
As far as presentation and Navigability goes which pro photographer has the best website?

Taxonomy
inland water transport, navigable waters, Navigability, transport systems, United States, sea transport, unnavigable, free encyclopedia, water body, inland waterways, National Waterway, India, IWT, the Clean Water Act, inland waterway, maintenance cost, the Netherlands, inland.

Defination from the web:
Navigability also depends on the size of the vessel: A small river may not be navigable by a freighter, but it might be navigable by a smaller ... Also, the Clean Water Act use the term "navigable waters," "navigable waters of the United States" and "navigability. ...