As you wish.
This is the link you were kind enough to provide:
NOAA updates their nautical charts with corrections published in:
U.S. Coast Guard Local Notices to Mariners (LNMs),
National Geospatial-Intelligence Agency Notices to Mariners (NMs), and
Canadian Coast Guard Notices to Mariners (CNMs).
Note: If a chart update is first published as an LNM and then later as an NM, the chart correction is listed just once and referenced to the earlier LNM publication. A similar relationship exists between CNMs and NMs.
NOAA's Chart Update Service
From this site, you can access the same chart updates that NOAA uses to update their Print-on-Demand paper charts, Raster Navigational Charts (NOAA RNC®), and Electronic Navigational Charts (NOAA ENC®). This site also provides advance notification of chart updates affecting hazards to navigation and other information considered essential for safe navigation, including:
Bridge and cable clearances, and
Regulatory changes that NOAA has identified and forwarded for publication in both the LNM and the NM.
Temporary changes to aids to navigation, special published announcements, and other important information affecting navigational safety
are not available on this site.
NOAA Chart Update Disclaimer - Please read carefully
While information provided by this Web site is intended to assist in the updating of nautical charts, it must not be used as a substitute for the United States Coast Guard, National Geospatial-Intelligence Agency, or Canadian Coast Guard Notice to Mariner publications.
The information available on this site is derived from the National Ocean Service’s Critical Chart Corrections database (CRIT). CRIT is an in-house chart production tool, and may contain some naming conventions, textual abbreviations, or acronyms that are unfamiliar to the general public. Channel tabulations, depth
notes, and chartlets may not be included in chart update listings prior to January 2000, due to ongoing development of CRIT throughout the 1990s.
I read it through, then I read it through again. Then I searched it for the string "week".
I am now confident that it does not say anything about weekly updates, because it does not include the string "week".
It also says that the information on this site is derived from a database that is used as an in-house production tool. That is, this database is used to update charts.
There is a large number of huge steps between information and a finished chart. This database is not a finished chart, this database is used by cartographers to produce finished charts. This is a list of corrections, not the corrections themselves. That is an important distinction in this discussion.
And now, specifics.
In LNM 9/13, District 13, on chart 18446, a yellow research
bouy was deployed off of Spring Beach at 47-43-44 N, 122-23-40 W. That bouy has (had) the characteristics FL Y 4S 1m.
That bouy is still not on the charts, and never has been. I downloaded a new chart five minutes ago to be certain.
I added 8 lights to Anacortes Marina about eight weeks ago by hand, and had been watching them as my litmus test, but as luck would have it, they showed up when I went to look today.
When talking to me, one should never discount the possibility that I am wrong. So this could simply be my lack of education about charts and LNMs.
The last set of specifics I mentioned above, the lights in Anacortes Marina, were listed under Section IV, Chart Corrections of the LNM. The bouy off of Spring Beach was listed in Section VII, General. The Spring Beach bouy was listed with monotonous regularity, for about a year. (More or less, I didn't write it down, and I'd have to go back and look.) Then, about three weeks ago, the listings stopped. No explanation, just no listing.
What it looks like to me is this: Section IV, Chart Corrections, go on to become a permanent change to the charts, and, in due time, (certainly not "weekly"), show up on Print On Demand charts. But changes listed in Section VII, General, appear to simply go away. Silently, with no fanfare.
My question is this: is the bouy (and light) off of Spring Beach still there? Should it be a permanent part of my charts now? Or has it served it's purpose, and been removed?