Very High Frequency Omni-Directional Range (VOR) stations are ground-based radio beacons that have historically provided aircraft navigation by transmitting signals to determine an aircraft's bearing.

Pilots can approach St. Louis via two VORs: STL and TOY, each with a designated radial for approach. The STL VOR approach uses the R-194 radial, while the TOY VOR approach uses the R-261 radial (NoPT) ...

Situated on the northwest of the St. Louis metropolitan area, the St. Charles County Smartt Airport (KSET) in Missouri is a busy general aviation facility that many pilots use to get into the area.