The data supplied here are a compilation of information collected from some 270+ current or pre-release National Ocean Service Navigation Charts. In compiling this product no attempt was made to ascertain the congruency between the charted data, and the real world. The objective was to simply capture the representative coastline as provided via the NOS Chart. Every effort was made to capture the shoreline on these charts as faithfully as skills and technology allowed, and there is every indication that this was successful. However, in doing so, the character of those data (all aspects, both good and bad) were conveyed to the digital product. A character which may or may not be in agreement with the real world. Because of this, the user is advised to exercise caution in making any assumptions about the fallibility, or infallibility, of the spatial information supplied here; especially when circumstances warrant a high degree of absolute positional accuracy.
Spatial data were derived directly from national Ocean Service Navigation Charts. The NOS Chart Products meet or exceed national Map Accuracy standards (hard copy); the digital data supplied in this compilation should, when plotted at scale, meet or exceed these same cartographic standards.