> their error reading is around centimeters, since they have the
> error correction algoritm (random error sent down on purpose -

I think you will find that this is obtained using the L2 frequency and data
stream which I believe has a 10x data rate over the L1 data stream.

The L1 frequency and data stream is just a "rough get you in the ball park
quickly" fix and is the only data stream available to the open market.

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