The theoretical limit is down to the integration time for the receiver,

typically 1-10ms. If you want high dynamics, you need to update faster.

For car racing, it's probably closer to 1ms.

Most comercial receivers output 1 position per second because it takes

some number crunching to compute the satellite positions and solve for

the receiver position. This is purely a matter of computing power.

Given a fast enough processor, 1000 positions per second is possible.

I was running an automotive receiver IC (60MHz,32bit MIPS processor)

at about 10 fixes per second, getting close to 100% CPU.

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