Although the chart is an image data source and contains no associated attribute data, depth soundings in feet at mean lower low water are noted on the image. The online raster version of nautical chart 18656 is made available in a WWW GIS program in order to facilitate intergration of this data source with other related datasets. BSB Electronic charts is a partnership of the Better Boating Association, Blue Marble Graphics of Gardiner Maine, and James Sewall Company of Old Town Maine.
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Positional accuracy in meters is 28.00. State Plane, zone 403, NAD 83. This nautical chart represents a subset of available bathymetric and other nautical information for the charted area. This tiff file also came with an accompanying reference file of coordinate information. Email is best contact method.