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Richard,

Thanks for all the great info (and links).  I wish we had this conversation two weeks ago before my Electronic Fixing aids segment of my course, my presentation, and the EFA exam.

Pete

> Dual-frequency civil GPS receivers (used chiefly by the
> surveying, geodesy, and machine-control sectors) use
> special techniques to make measurements on the L2
> frequency. These techniques do not require access to the
> crypto codes. These receivers are neither SPS or PPS
> receivers, per se. There's a wealth of information on L2
> tracking on the Web and in various publications. To get a
> hint about L2 tracking, go to .