Maturing iPhone apps, troubled ENC edition

Ben Ellison

Ben Ellison

Panbo editor, publisher & chief bottlewasher from 4/2005 until 8/2018, and now pleased to have Ben Stein as a very able publisher, webmaster, and editing colleague. Please don't regard him as an "expert"; he's getting quite old and thinks that "fadiddling fumble-putz" is a more accurate description.

18 Responses

  1. Sandy Daugherty says:

    All these charting apps have a hidden benefit: NOAA charts are now in the hands of thousands of more users.
    It would be wonderful if they could easily report errors to NOAA. Perhaps a hundred reports of the same error might prompt a quicker correction.

  2. Ben Ellison Ben Ellison says:

    I can’t figure out how to report errors to NOAA at all, and I volunteered to do it regarding those channel buoys on behalf of the Harbor Committee I sit on. Does anyone know of an online form for reporting NOAA chart errors?
    PS I’ve noted before that Navionics Mobile has a neat function for emailing in mistake reports, but I think it only applies to mistakes Navionics makes in copying official data or adding their own. I’m afraid that Garmin, Navico, Jeppesen, and Navionics are all working now to copy those misplaced and misnumbered buoys (and the invented harbor piers), and won’t feel comfortable about correcting them until NOAA does. It could take years to get that mess fully straightened out. Funny that I used to use that very channel as an example of important stuff the chart might not tell you, but photo maps often could.

  3. Carl says:

    I have seen this link on the NOAA site. Not sure if it is what you are looking for or not.

  4. Ben Ellison Ben Ellison says:

    That’s it, Carl; thanks so much! It’s a well done form, too, and you can even upload sample images to NOAA, which I did. It will be interesting to see how quickly they’re able to respond, and then how long it takes to straighten the charts out.

  5. Jeffrey Siegel says:

    Panbo…fixing nautical charts, one buoy at a time! Well done, Ben!
    You should try the new Simplified symbol setting in Navimatics so the red buoys display in red, etc. Maybe it’s just me but I dislike the traditional IHO black and white symbology.

  6. Jim Starr says:

    United States Power Squadrons (USPS) has a ~40 year old partnership with NOAA called Cooperative Charting through which USPS members provide high quality chart corrections to NOS. Corrections are generated following strict procedures and are submitted to NOS electronically after local review. Corrections can be approved and posted to the online versions of charts in a matter of weeks.
    It appears from their website that the Mid-Coast Sail & Power Squadron in your area (Rockland-Rockport-Camden) has an active Cooperative Charting program. I’d suggest you contact the squadron commander, George Sayre (207-593-9064, [email protected]) to see if his trained folks can get tne needed changes made.

  7. John Navas says:

    Crowdsourcing of navigation data, or anything else related to safety, is a dreadful idea, roughly akin to unprotected sex with strangers in a bus terminal. It’s one thing to take local advice under advisement, especially when you know the adviser, but another thing entirely to take anonymous anecdotal advice at face value.
    My own experience (from an error I reported) is that NOS/USCG promptly issues a Notice to Mariners when it gets a credible and verifiable report of a significant error. The bigger problem is that few recreational boaters take any notice of them.

  8. Jeffrey Siegel says:

    Wow…I surely have a different experience. January will make 4 years we’ve been collecting navigation and cruising information from users. What I’ve found in my own cruising is that I totally rely on the user-generated data well beyond whatever the NOAA charts show. So much of the charts in the cruising areas haven’t been touched by NOAA in decades. Want to know where the next LNTM entry will be? Find an ActiveCaptain hazard. Ben’s example for Camden harbor is a perfect one of someone with true local knowledge providing it to others. Watch a LNTM entry appear there in a couple of months (after the Maine cruising season is over).
    Can the data just come randomly from people? Of course not. There needs to be a way to gauge the experience of the person writing the entry. Click on the first screen shot at the top. You’ll see that it was made by Ben Ellison of Camden, Maine with 252 points. The points are the number of accepted updates and reviews he has made in the past and 252 means he’s done a lot. Knowing he’s from the local area make the data pretty highly qualified and something to be noticed no matter what the charts show.
    Now imagine a piece of data with 9 different people giving input – all rated with a great opportunity to evaluate the information. There are many markers like that including one on a section of the Alligator River where the NOAA charts have been wrong for a couple of years now. Years! If you pass through there, you’ll hear calls to the towing companies every day. Here’s a direct link to see the spot:
    So while I think I’ll be staying away from bus terminals for almost any activity, I’ll continue to use and rely on navigation information sourced by real experts – the ones out there with local knowledge.

  9. peter coupland says:

    Same issues up in Canada.
    for example…2004 Navionics chip for BC waters has more depth contours than 2005 Navionics chip .
    Reason?Not Navionics fault..some bureaucrat in Ottawa decided to save a few pennies and remove them and never asked us boaters what those little sqiqqlly lines on those maps was about!arrrghhhhh

  10. Sandy Daugherty says:

    Hot diggity! a Debate! This time its the elites vs. the Hive! Don’t I wish this question were more closely rooted in reality.
    Tell me, John Navas, why your solution didn’t work in Camden Harbor?
    If your task is to sweep out the hangar deck, would you rather have one really good broom, or a hundred half serious ones?

  11. Kurt says:

    In addition to submitting on the link above, I would suggest talking to the regional NOAA “Nav Manager.” Ed Martin is still standing in until the position is filled.
    The regional people are there to help with all sorts of issues.

  12. Ben Ellison Ben Ellison says:

    Yikes…out of the frying pan (of whale meat), and into the fire. This evening John Navas added this to the Panbo link on his site: “warning: some of the advice is dangerous,” highlighted in red even!
    Well, John, I think we both presented our cases sufficiently here and at Oddly enough, I think we were both delivering unofficial safety related advice about using unofficial advisory data. And in a similarly meta manner, our readers now face a classic dilemma of the big vague phenomenon you like to call crowdsourcing, i.e. which of two contradictory sources is correct (if either):
    1) A wise navigator never uses anything but official navigation data because unofficial data may lead to STDs or worse.
    2) A wise navigator uses every bit of data available, but trusts none of it completely.
    I’m hoping that maybe our argument illuminated those divergent points of view, and I thank you for that, John.

  13. TimT says:

    For more info on the TeamSurv project have a look at my post on – I won’t clog up Ben’s blog by cutting and pasting it here.
    Amongst all the usual usenet crud, there are some useful observations in the thread.
    One other thought: how many of you how just want to use official data use charts from C-Map or Navionics? Both of these companies incorporate signifcant amounts of unofficial data from cruising guides etc in their harbour scale charts (I’m not sure about Garmin, but suspect they do as well). For an interesting exercise to see this, take an area popular with leisure but not with commercial traffic, look at the chart coverage using C-Map’s leisure charts, and then at the same area using their S-57 charts for commercial shipping, and you’ll find the latter have much less detail. So, to continue the recent controversial debates here, perhaps you should all switch off your chart plotters in coastal waters in case you become tainted with unofficial data!

  14. Ben Ellison Ben Ellison says:

    Thanks to Jim Starr and Kurt for references to concerned parties who might help straighten out our local harbor chart (and also to those who have e-mailed suggestions). I wrote to both recommended parties this morning.
    And I want to recommend reading Tim Thornton’s long post this morning at explaining the whys and hows of “crowd sourced” depth data. And it’s good to see the mood there turn less pedantic.

  15. Rick says:

    Sherri & Nick & Sweet Time screenshot is just what we saw a month ago in the same area. This is only one of several places on the ICW where the NOAA charts are wrong. I agree with Jeff Siegel that user generated data is most valuable. User generated data is also available from, Skipper Bob, and probably others. None are always accurate, but add them all together and you have a pretty good idea of what is out there
    The problem with NOAA ENC and Raster charts is that there has been a lot of dredging on the ICW in the past couple of years, and the new channels are not always in the same place, eg: Stewart Fla, Alligator R. NC. But in every case markers have been moved or new ones added. In our trip up the ICW in the past month, I never felt that I was being led astray by misplaced markers. As always, follow the markers and not the charts.
    Having said that, I find the NOAA charts accurate 98% of the time. We use both the printed and E versions exclusively. And that the E versions are available for free is even better.

  16. Rick Brennan says:

    While NOAA is responsible for charting buoys and navigation aids, they are not the source of that data. The Coast Guard provides navigation aid information to NOAA using their ATONIS data base. Charted positions and characteristics of Coast Guard navigation aides are then extracted from the data base and charted. If errors are seen in aids to navigation, this should be immediately reported to the local Coast Guard.
    Display of this information is a whole other story. Unless you are using a “type-approved” Electronic Chart Display and Information System (ECDIS), you are at the whim of the computer programmer as to what information is displayed, and how it is displayed (i.e. what receives cartographic precedence). The International Hydrographic Organization (IHO) controls the data requirements for ENC’s (data) and the International Maritime Organization (IMO)control all display requirements. The vendors creating these applications are not beholding to any of these standards.

  17. Ben Ellison Ben Ellison says:

    Rick, thank you very much for commenting on Panbo. I want to make it perfectly clear that I hold no animosity toward NOAA at all. Your mission seems vast, and difficult.
    But I do have a lot more questions about the specific local chart problems I’m seeing along with more general ones about ENC presentation and NOAA’s quality control process. I intend to write a separate entry about it next week, but I should get a chance this weekend to collect some data on just where those channel buoys are set now, which is close to where they’ve always been set.

  18. Michael Henderson says:

    First, happy 4th of July to all. Thanks to Rick Brennan for his excellent summary. And Ben, Rick and his staff are a great source for the latest re: the international standards. Best to all, and be safe out there.

Join the conversation

Your email address will not be published. Required fields are marked *