code loops and costas loops

I am reading some stuff about GPS and came across some questions ... A little baffled by the author, but maybe you guys can sort it out for me ..

in a GPS receiver which one of the following does the "code tracking loop" and the "costas loop" perform ...

doppler shift, lock to c/a code, removes clock bias, lock to the navigation message bit rate, or account for relativity ??

any ideas ?

 

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