For a precision approach procedure
(ILS, GCA): Ceiling 600 feet and visibility of two statute miles.
It says that as far as your alternate goes, if specific alternate minimums are not published for that airport (more on this in a minute), and if between an hour before and an hour after you expect to get there (same as the 1-2-3 rule), the airport is expected to have at least a 600-foot ceiling and two miles visibility, you can use it if and only if it has a precision approach procedure
Honeywell's satellite-based navigation technology will enable the FAA's LAAS program to utilize airspace more efficiently, plus provide new precision approach procedures
," said John Oelschlaeger, Director of Honeywell's Satellite Landing Systems Business.