Montana State University


Montana State University
PO Box 173120
Bozeman, MT 59717-3120

GPS Lab Manager:

Diana Cooksey
Tel: (406) 994-5684
Fax: (406) 994-3933
Location: 245 Leon Johnson Hall

MSU GPS Base Station: NGS CORS Station ID MTSU

College Office

NetRS Receiver

RINEX files are available for download. For security reasons, the base station files FTP site requires a username and password. Complete instructions are posted below. Please read and follow them carefully.

Note: If you are using Pathfinder Office software, you can retrieve base files from the Differential Correction utility via the Internet. Be sure to update the base provider list and then select one of the two entries for CORS, BOZEMAN (MTSU), MONTANA. Both entries have ITRF 2000 coordinates, however, the NEW entry derives its ITRF00 coordinates from IGS08 (a more updated reference frame). The difference between the two frames in only a few centimeters at our site. Please see the Trimble Support Note that explains the coordinate differences. We are working out best practices for differential correction using Pathfinder Office and they will be posted here soon.

If you are unable to correct your data via the Pathfinder Office Internet search, you may download base files from our FTP site. Save the files in your project base folder and run the differential correction using a folder search rather than an Internet search. Make sure you choose "Use reference position from base files." The link below has been tested and works in Firefox, Chrome and Internet Explorer. Once you connect, navigate to the RINEXv211 folder and drill down until you find the files you need.

Data Storage:
Data files are normally available online for at least 28 days, after which they will be deleted. Data are not archived prior to deletion and are therefore unrecoverable. Users are encouraged to download data as soon as possible.

File Naming:
Each file is named using a MTSUDOYS.DAT format. MTSU is the station ID, DOY is the day of year, S is the hour of the day (A through X) based on GPS time (not local time). 

Important note: 
Unless the system is experiencing technical difficulties, the last file listed should contain data for the most recent complete GMT hour and the current date. Because your computer may cache and then display an earlier version of the window, it may not show the most recent files available. If the file you seek is more recent than the bottom file in the "ftp" window, the listing can be updated by refreshing the window.

Site Details

Datum: NAD 83 (2011) Elevation Mask: 0° Data collected with Trimble
Latitude: 45° 39' 40.37689" N Logging Interval: 5 s NetR9 GPS receiver
Longitude: 111° 02' 42.00898" W Rollover period: 1 hour  
Height: 1495.496 m Antenna ht: 0 m  

Note: this is the official NGS position.