July 10, 2014 

 

                       - 18649 San Francisco Entrance

                       - 18652 San Francisco Bay to San Pablo Bay

                       - 18654 San Pablo Bay

 

Where does this information come from?

 

Do you remember the airplane crash from April 27th that occurred over the Bay?

 

The mangled airplane fuselage and the victim were located and removed. However, additional debris was left behind.

 

That's where the Navigation Response Team comes in. NOAA's Navigation Response Teams survey the seafloor in ports and harbors that have undergone infrastructure updates, shoreline alterations, or seafloor changes. They measure depths and look for underwater hazards that could endanger vessels, to update nautical charts for commercial and recreational mariners.

 

The NOAA team believes there to be a Danger to Navigation (DTON) that should be charted, and submitted their recommendation to be included in the Local Notice to Mariners saying "This is an area where not only boat traffic tends to cut corners out of the main channel but the debris location is also outside of a private marina where many boaters transit." 

 

What does this mean to us? 

We should use the information provided in the Local Notice to Mariners to update our paper charts just like the one pictured above.

The information given in the LNM Week 25/14 is to ADD an Obstruction in Feet; 8 Obstn and gives us a reference to the Chart No. 1 entry K41.

 

 What is meant by "least depth known"? The "10m" in this illustration represents "least depth known".

 

 

 

So correct your charts, take care transiting the area and look for the Local Notice to Mariners link in each of our weekly newsletters for more navigation information 

 

Or subscribe and have it delivered to you by email here:

http://www.navcen.uscg.gov/?pageName=listServerForm 

In This Issue