1. A method comprising: receiving signals from a satellite navigation system and signals from a terrestrial wireless communication system; receiving a timing bias from the wireless communication system, wherein the timing bias includes a common system synchronization bias that defines a difference between a system time for the satellite navigation system and a system time for the wireless communication system; and determining a position solution for a mobile unit based on a hybrid position location technique for an asynchronous environment, and as a function of the received signals, a number of independent measurements based on a position location technique for a synchronous environment, wherein the number of independent measurements is fewer than a minimum number of measurements for an asynchronous position location technique, and using the common system synchronization bias.