I want to install GPS on Arduino robot, is it ok?
Yes, it is has been done many times. You will probably have to use software serial to read the output.
GPS usually does not work indoors, and the very best you can expect outdoors, with a clear view of the sky, is about +/- 3 meters positional accuracy.
Thanks for your answer. Would you like to give some adive about cheap outdoor-robot? I want to do some experiment on navigation.