According to another aspect of the techniques described herein is a method comprising receiving, at a receiver from a transmitter, a digital code. This aspect further comprises receiving, at the receiver, first electromagnetic waves. The first electromagnetic waves are decoded corresponding to a first polarization in response to a first value of the digital code. Second electromagnetic waves are received at the receiver, and the second electromagnetic waves are decoded corresponding to a second polarization in response to a second value of the digital code. The first information and the second information may include a first navigational code and a second navigational code, respectively, and the decoding of the first navigational code and the second navigational code may include correlating with local versions of the first navigational code and the second navigational code, respectively.