This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. The National Waterway Network is a comprehensive network database of the nation's navigable waterways. The data set covers the 48 contiguous states plus the District of Columbia - Hawaii - Alaska - Puerto Rico and water links between. The nominal scale of the dataset varies with the source material. The majority of the information is at 1:100 - 000 with larger scales used in harbor/bay/port areas and smaller scales used in open waters. Last Updated: 06/2013 Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Transportation/MD_Transit/FeatureServer/21 ADDITIONAL LICENSE TERMS: The Spatial Data and the information therein (collectively "the Data") is provided "as is" without warranty of any kind either expressed implied or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct indirect incidental consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.