California Department of Transportation

Caltrans - District 6

  • Sharri Bender Ehlert
    District 6 Director

    Serving Fresno, Kern, Kings, Madera, and Tulare Counties

District 6 Land Surveys

Caltrans District 6 Fresno Metropolitan Area Map link

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CVSRN Reference Station

Reference Station - SIMM

Location: county of san luis obispo Maintenance yard in simmler, ca.

Owner: Caltrans central region Surveys


Station with custom securty enclosurer

GPS Antenna

GPS and dual cellular yagi antennas

GPS Equipment Vault

Station enclosurer opened

GPS Equipment Used at COMA

NetR9 GPS unit and Airlink cellular modem

Custom Built GPS Antenna Cable Using Heliax

General Station Information

  • GPS unit - Trimble NetR9 (GNSS)
  • GPS Antenna - Trimble Zephyer Geodetic Mark 2
  • Monument Type - Electrolier Pillar

Available Reference Station Information

  • Request static GPS data from this station ** - Coming Soon
  • Realtime access to this station from CRTN, CLICK HERE ***.
    Please Note, not all station are availabe through CRTN.

** Please note, all request for data MUST BE accompanied by a Public Records Act Request Form. Click here to to obtain a copy of the the form.

*** Please note, neither Caltrans nor CRTN makes any guarantees to the correctness, accuracy or availability of the data obtainded from the CTRN servers. CLICK HERE for an Excel spreadsheet of all stations that are availavble from through CRTN.