This is correct, but I'd like to add that at some point the errors from which frequency and code you use is no longer the dominant factor in the position error.

This is correct, but I'd like to add that at some point the errors from which frequency and code you use is no longer the dominant factor in the position error. Depending on where you are, either multipath errors (eg due to reflections from buildings or mountains) or athmospheric errors (ie due to the radio signal being distorted in the ionosphere) start to dominate.