System for determining an object position on a site with large machinery, particularly a mine site, a construction site, or an agricultural area, the system comprising • a point-to-point radio ranging unit having ∘ a plurality of radio transceivers as anchors, wherein the anchors are adapted and specifically foreseen to be mounted on large machinery, particularly a haul truck, a crane, a dragline, an excavator, a shovel, or a tractor, and ∘ a plurality of radio transceivers as tags, wherein the tags are adapted and specifically foreseen to be carried by a movable object, wherein the point-to-point radio ranging unit is configured for providing ranging data indicative of distances between anchors and tags, based on a defined measuring protocol, particularly based on the ALOHA protocol, of a time-of-flight measurement by radio frequency signals, particularly ultra-wideband signals, and • a position determining unit configured for determining position information of tags based on ranging data of the point-to-point radio ranging unit, wherein the system is configured • to determine a current position of a reference point indicative of a position of a machine of the large machinery, • to access an arrangement dataset indicative of a positional relationship between the reference point and a mounting location of at least one of the anchors on the machine, and comprising data from a relative navigation system of the machine for determining an orientation and relative movement information of the machine, • to determine a position of the at least one anchor based on the current position of the reference point and the arrangement dataset, namely by taking into account the current position of the reference point as well as the positional relationship and the orientation and relative movement information, and • to provide the position of the at least one anchor to the position determining unit, characterized in that the position determining unit is configured for determining a position of at least one other of the anchors based on the position of the at least one anchor. • a point-to-point radio ranging unit having ∘ a plurality of radio transceivers as anchors, wherein the anchors are adapted and specifically foreseen to be mounted on large machinery, particularly a haul truck, a crane, a dragline, an excavator, a shovel, or a tractor, and ∘ a plurality of radio transceivers as tags, wherein the tags are adapted and specifically foreseen to be carried by a movable object, wherein the point-to-point radio ranging unit is configured for providing ranging data indicative of distances between anchors and tags, based on a defined measuring protocol, particularly based on the ALOHA protocol, of a time-of-flight measurement by radio frequency signals, particularly ultra-wideband signals, and ∘ a plurality of radio transceivers as anchors, wherein the anchors are adapted and specifically foreseen to be mounted on large machinery, particularly a haul truck, a crane, a dragline, an excavator, a shovel, or a tractor, and ∘ a plurality of radio transceivers as tags, wherein the tags are adapted and specifically foreseen to be carried by a movable object, • a position determining unit configured for determining position information of tags based on ranging data of the point-to-point radio ranging unit, • to determine a current position of a reference point indicative of a position of a machine of the large machinery, • to access an arrangement dataset indicative of a positional relationship between the reference point and a mounting location of at least one of the anchors on the machine, and comprising data from a relative navigation system of the machine for determining an orientation and relative movement information of the machine, • to determine a position of the at least one anchor based on the current position of the reference point and the arrangement dataset, namely by taking into account the current position of the reference point as well as the positional relationship and the orientation and relative movement information, and • to provide the position of the at least one anchor to the position determining unit,