Alliance for Safe Navigation, & chart reality questions
The photo is from a BoatUS press release discussing how it, NOAA, and several other organizations are concerned that many boaters are using outdated charts. They’ve even got a survey going (quick and easy), and I bet the results will confirm their worry. But while the new Alliance for Safe Navigation they’ve formed leads to a neat Notice to Mariners tool I hadn’t seen before, I worry about more than keeping up with NOAA’s chart changes…
No offense meant to NOAA, but I question its ability to manage the data it’s already amassed and to keep up with ground truth. When I look up my local chart 13307 at the nifty NTM site, I notice the odd new private channel buoys — the real ones aren’t cans or nuns, aren’t numbered, and most aren’t where charted — along with the special anchorage boundary that somehow got an extra corner on the ENC version, a confusion that’s now being copied by some of the commercial chart makers. (As illustrated here and here.) Admittedly these are fairly trivial matters, but if they can get screwed up en route to your chart plotter or charting program, what else has?
I also worry about electronic chart presentations. Remember my friend who hit a slightly submerged crib on the Kennebec river and wanted to blame his Garmin charts? Well, check out the BlueCharts seen on that entry versus the RNC and ENC views of the same area below. I don’t think the ENC, though zoomed in, warns folks about those cribs nearly as well as the RNC/paper chart, or the Garmin chart.
So how do you all deal with these issues? Do you keep your charts updated? Have you seen errors? Where else do you look for info? Do you still use paper charts sometimes (honest answer, please)? Which electronic charts do you favor, and why? Do you have tricks to get the presentation optimal?
Print-on-demand plan treats charts as data
February 21, 2004
Electronic Nautical Charts Developments
May 19, 2004
Not All Electronic Chart Databases Are Equal
September 23, 2004
Installing A GPS Chartplotter
May 28, 2004