Foreign airlines must use GPS approaches at SFO?

[Hartington]

FAA urges foreign airlines to use GPS at San Francisco airport | abc7.com (http://abclocal.go.com/kabc/story?section=news/state&id=9188772)

News Talk Radio 77 WABC New York - FAA Places Restrictions on Foreign Pilots Landing at San Francisco [From ABC News] (http://www.wabcradio.com/common/more.php?m=58&ts=1375100753&article=DC164B8FF82B11E286DEFEFDADE6840A&mode=2)

Can someone please tell me where to find the information on which these articles are based. What is a GPS based landing system? Are we talking RNAV?

Is the notice that has been issued by the FAA mandatory or advisory?

[Capn Bloggs]

Don't know the details on the actual FAA edict/suggestion, but have a look down the page a bit here:

AirNav: KSFO - San Francisco International Airport (http://airnav.com/airport/KSFO)

for the RNAV approaches for SFO, in particular the RNAV (GPS) for 28L.