On Mon, Apr 20, 2015 at 10:47 AM, John F. Eldredge <j...@jfeldredge.com> wrote:
> The location of the deepest channel can change over time, as mudbanks or > sandbanks shift position. This is why commercial vessels operating on > rivers frequently rely upon a succession of pilots, each familiar with a > particular portion of the river. Unless an OSM mapper has surveyed a > portion of the river recently with a depth gauge, they would have to rely > on possibly-out-of-date information from some other map. At least to the navigable depth, in theory, this can be inferred from navigational markings for anyone familiar with the relevant fixtures, beacons and bouys.
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