Digital & Paper Chartkits
The MapTech Chartkit paper editions have "update" pages for each chart in the back, near the back cover. Each year they publish a new edition having chart pages incorporating as many updates as they can, leaving the remainder to those back pages for you to use in manually updating charts of interest.Remember, the chart pages they publish are infrequently revised/re-issued by NOAA. So, you'll inevitably read an "old" date on those chart pages. You can go to the NOAA website and get a list of the most recent chart editions and revisions available. http://chartmaker.ncd.noaa.gov/The USCG NAVCENTER website lists the Local Notices to Mariners (LNMs) on a weekly basis, so it is up to the mariner to read them regularly & make the necessary chart changes manually. The USCG, facing reduced budgets, has shifted or eliminated many ATONs over the past years. http://www.navcen.uscg.gov/Ditto for using the Digital Chartkits, although they might be more likely to incorporate all the LNM corrections up to the date-of-issue on the CD-ROM release. Same applies to the use of C-Map cartridges, etc. in chartplotters. Be prudent operating in shoal waters and relying on a chartplotter. Things are not always what they appear to be out there. The very nature of the surveys used to create nautical charts makes it inevitable that an underwater obstruction can be missed in the process. A very good treatise on the subject is in Section 1 of Nigel Calder's new book "How to Read a Nautical Chart." It should be a "must-read" for anyone doing coastal piloting and navigation.--RonD