Hello All, First post! I had a question about the SFO Class Bravo boundaries. On the San Francisco TAC, there are a variety of VFR waypoints in the SF Bay Area that start with "VP" and are mostly associated with landmarks for pilotage. However, there is a second set of waypoints that start with "VPB" that are closely associated with and happen to lie on the intersection and inflection points of the SFO Class Bravo boundaries. I took a quick look at LAX, SAN and SEA and they do not have these "VPB" waypoints. So, my question is why does the SFO Class Bravo have these when other Class Bravo airports do not and what are they used for? Would a pilot actually load these "VPB" waypoints for navigation purposes or are they just well-determined "air-buoys" of sorts to be avoided for us bugsmashers?