It actually does. Having GLONASS adds to the amount of Satellites you connect to. More accurate, quicker response having GLONASS in addition to A-GPS
There are 4 Main types of GPS:
A-GPS - Assisted GPS (abbreviated generally as A-GPS and less commonly as aGPS) is a system that often significantly improves startup performance—i.e., time-to-first-fix (TTFF), of a GPS satellite-based positioning system. AKA CRAP!
GLONASS - GLONASS is an acronym, which stands for Globalnaya Navigazionnaya Sputnikovaya Sistema, or Global Navigation Satellite System. GLONASS is Russia’s version of GPS
BDS - The BeiDou Navigation Satellite System (BDS ) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale global navigation system that is currently under construction. Chinese Version of GPS
GALILEO - Galileo is the global navigation satellite system (GNSS) Europes version of GPS