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GNSS Continuously Operating Reference Station (CORS) MSOL

RTK CMR+ corrections are available via the ip address: 
RTCM 3.x corrections are available via the ip address:


  • Latitude of ARP: 46° 55' 45.83772" North. 
  • Longitude of ARP: 114° 06' 31.84489" West. 
  • Horizontal Datum: NAD83 (2011). 
  • Vertical Datum: NAVD88. 
  • Height above Ellipsoid to L1 Antenna Phase Center (as per NGS): 3151.82 US Survey ft., 960.678 m. 
  • Height above Ellipsoid to Antenna Base (as per NGS): 3151.61 US Survey ft., 960.612 m. 
  • Orthometric Height of L1 Antenna Phase Center (by calculation): 3200.91 US Survey ft., 975.639 m. 
  • Orthometric Height of Antenna Base (by differential levels): 3200.72 US Survey ft., 975.581m *. 
  • Receiver: Trimble NetR9. 
  • Antenna: Trimble Zephyr Geodetic 2 RoHS TRM 57971.00. 
  • Survey Data epoch: 1 second. 
  • Mask = 5°. 
  • Receiver operates 24 hours per day, 7 days per week

The orthometric height of the ARP was determined by 3-wire differential leveling to NGS benchmarks G 14 Reset and R 446, using a Zeiss Ni2 level, to be 975.587m on July 15, 2003.

*An orthometric height of the ARP was determined using first-order equipment and methods to be 975.581m. That level run will be submitted to NGS for publication.