Space debris is largely an issue for low earth orbit, through will all space activity has to pass through and is a pretty tight orbit. GPS satellites are in geo

Space debris is largely an issue for low earth orbit, through will all space activity has to pass through and is a pretty tight orbit. GPS satellites are in geosynchronous orbit which is over 30,000km from the surface of the earth so there is much more volume of open space, making debris a much smaller risk (for the same amount of debris, since 600^3 << 30,000^3).