<html><head></head><body>In my experience, rivers, unlike harbors, generally don't have buoys or other markers showing the location of the navigational channel, probably because the flow would be likely to wash them away.<br>
<br><br><div class="gmail_quote">On April 21, 2015 1:08:42 AM CDT, Paul Johnson <baloo@ursamundi.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, Apr 20, 2015 at 10:47 AM, John F. Eldredge <span dir="ltr"><<a href="mailto:john@jfeldredge.com" target="_blank">john@jfeldredge.com</a>></span> wrote:<br /><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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an OSM mapper has surveyed a portion of the river recently with a depth gauge, they would have to rely on possibly-out-of-date information from some other map.</blockquote><div><br /></div><div>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.</div></div></div></div>
<p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr /><br />Tagging mailing list<br />Tagging@openstreetmap.org<br /><a href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a><br /></pre></blockquote></div><br>
-- <br>
John F. Eldredge -- john@jfeldredge.com<br>
"Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that." -- Martin Luther King, Jr.</body></html>