Some areas change a LOT more than others. I've been sailing on San Francisco
Bay, the California Delta
and the coastal ocean for 35 years, and can only remember less than a half dozen buoy changes: 1) G "3" just north of the old Bay Bridge east side has been removed, since they built the new bridge right on top of it!
; 2) newer G "1" NE of Alcatraz; R"2" south of the D/E span of the western side of the Bay Bridge is relatively (ha!
) new maybe 20 years!
That's about it, maybe some up in the Delta
Other than the "Lightship" being changed from a real vessel to a Racon to a newer solar
buoy within the past 50 years, there haven't been that many changes.
Back east and in other ports
on the West Coast
, I am sure that there are many more frequent changes, due to depth
, shoaling, dredging, shipping
Like many things in boating
: "It all depends..."
I used to update my charts by the old snail mail LNMs, but found that most of the reports were of damaged buoys that were in the process of needing to be replaced or repaired. I even subscribed when they went digital with email
notices, and followed them for awhile. There's a major Coast Guard buoy repair service
here on Yerba Buena Island. So I gave up bothering to do updates.
My Garmin GPS
Map 76Cx sd card charts show all the barges that were stationed north of the east side of the Bay Bridge for construction of the new bridge, but they're mostly gone by now, still on the chart and un-movable since they're embedded as part of the chart.