A method for determining a drift of a clock relative to a reference clock, the method being suitable for implementation in a real-time locating system comprising the reference clock and an anchor point, the anchor point comprising the clock and being configured to receive wireless signals emitted from an object tracked by the real-time locating system, the method comprising the steps of: receiving, by the anchor point, a first reference signal emitted from the reference clock, the first reference signal being a wireless signal and comprising a first departure time, the first departure time being indicative of a time when the first reference signal is emitted according to the reference clock; determining, by the anchor point, a first arrival time indicative of a time when the first reference signal is received according to the clock; receiving, by the anchor point, a second reference signal emitted by the reference clock, the second reference signal being a wireless signal and comprising a second departure time, the second departure time being indicative of a time when the second reference signal is emitted according to the reference clock; determining, by the anchor point, a second arrival time, the second arrival time being indicative of a time when the second reference signal is received according to the clock; receiving, by the anchor point, a further signal, the further signal being a wireless signal emitted from said object; determining, by the anchor point, a further arrival time indicative of a time when the further signal is received according to the clock; and determining, by the anchor point, the drift based on the first departure time, the second departure time, the first arrival time, the second arrival time and the further arrival time, the drift being an estimate of how much the clock has drifted relative to the reference clock between the second arrival time and the further arrival time. receiving, by the anchor point, a first reference signal emitted from the reference clock, the first reference signal being a wireless signal and comprising a first departure time, the first departure time being indicative of a time when the first reference signal is emitted according to the reference clock; determining, by the anchor point, a first arrival time indicative of a time when the first reference signal is received according to the clock; receiving, by the anchor point, a second reference signal emitted by the reference clock, the second reference signal being a wireless signal and comprising a second departure time, the second departure time being indicative of a time when the second reference signal is emitted according to the reference clock; determining, by the anchor point, a second arrival time, the second arrival time being indicative of a time when the second reference signal is received according to the clock; receiving, by the anchor point, a further signal, the further signal being a wireless signal emitted from said object; determining, by the anchor point, a further arrival time indicative of a time when the further signal is received according to the clock; and determining, by the anchor point, the drift based on the first departure time, the second departure time, the first arrival time, the second arrival time and the further arrival time, the drift being an estimate of how much the clock has drifted relative to the reference clock between the second arrival time and the further arrival time.