After December 31, 1999, and prior to January 1, 2006, any survey or map that uses state plane coordinates shall be based on, and show, field-observed direct connections to at least two horizontal reference stations that are one of the following:
(a)
Included in the CSRN.
(b)
Located outside the State of California and meet all the requirements for inclusion in the CSRN, except for the requirement that they be inside California.
(c)
Shown on a subdivision map, record of survey, or a map filed with the county surveyor by a public officer and whose horizontal positions have been determined by Global Positioning System survey methods in accordance with first order or better FGCS standards and specifications and whose state plane coordinates are based on field-observed direct, nontrivial connections to at least two stations that are included in subdivision (a) or (b).