1. A method comprising: receiving, by a device, measurement data for radio frequency (RF) signals between a wireless communication unit and at least one base transceiver station; calculating, by the device, an RF measurement based geolocation estimate for the wireless communication unit based on the measurement data; obtaining, by the device, geographical area data for at least two wireless coverage areas identifiable by the wireless communication unit; determining, by the device, a geolocation validation area based on the geographical area data for the at least two wireless coverage areas identifiable by the wireless communication unit, where determining the geolocation validation area includes: determining the geolocation validation area based on calculating an area of overlap of coverage areas for the at least two wireless coverage areas identifiable by the wireless communication unit; determining, by the device, whether the RF measurement based geolocation estimate is located outside the geolocation validation area; and deriving, by the device, a confidence factor for the RF measurement based geolocation estimate based on whether the RF measurement based geolocation estimate is located outside the geolocation validation area.