Unfortunately for you, the truth is that they can put these pre-trial restrictions on you. Did you have an attorney when they decided this? You should consider hiring an attorney for a bond hearing. You may be released from thy requirement, however this is a very fact intensive situation. I suggest you speak to an attorney immediately.
Guilford county uses the Gps device as a condition of pretrial release for certain serious crimes. You may petition to remove it, but you may be subject to posting a higher monetary bond in exchange. Most clients prefer the ankle bracelet in lieu of confinement in jail or a high bond.