An Augmented Reality -system intended and configured for use in the field of at least one of metrology, geodesy, and civil engineering, the AR-system comprising • a permanent marker (10,11,12) having a defined pose relative to a coordinate system, • a temporary marker (60,61,62,63,64) configured to be placed close to a location where an operation needs to be performed, said temporary marker having a coded design and an undefined pose relative to the coordinate system and relative to the permanent marker, • an AR-device having a camera, a display, and a processing unit, wherein the AR-device is configured to □ visually detect and identify the permanent marker, □ determine a relative pose between the AR-device and the permanent marker, □ visually detect and identify the temporary marker by the coded design, □ while the permanent marker and the temporary marker are both situated within the field of view of the camera, determine a relative pose between the permanent marker and the temporary marker, and □ based on the determined relative pose between the permanent marker and the temporary marker, define a pose of the temporary marker relative to the coordinate system, and wherein the AR-device is configured to, when a user is close to said location to perform the operation so that sight of the permanent marker is lost and the camera has only the temporary marker in its field of view, □ determine a relative pose between the AR-device and the temporary marker, and □ based on the defined pose of the temporary marker relative to the coordinate system and the determined relative pose between the AR-device and the temporary marker, augment a view of the coordinate system with an AR element (20,40,41) on the display. the AR-system comprising • a permanent marker (10,11,12) having a defined pose relative to a coordinate system, • a temporary marker (60,61,62,63,64) configured to be placed close to a location where an operation needs to be performed, said temporary marker having a coded design and an undefined pose relative to the coordinate system and relative to the permanent marker, • an AR-device having a camera, a display, and a processing unit, • a permanent marker (10,11,12) having a defined pose relative to a coordinate system, • a temporary marker (60,61,62,63,64) configured to be placed close to a location where an operation needs to be performed, said temporary marker having a coded design and an undefined pose relative to the coordinate system and relative to the permanent marker, • an AR-device having a camera, a display, and a processing unit, wherein the AR-device is configured to □ visually detect and identify the permanent marker, □ determine a relative pose between the AR-device and the permanent marker, □ visually detect and identify the temporary marker by the coded design, □ while the permanent marker and the temporary marker are both situated within the field of view of the camera, determine a relative pose between the permanent marker and the temporary marker, and □ based on the determined relative pose between the permanent marker and the temporary marker, define a pose of the temporary marker relative to the coordinate system, and □ visually detect and identify the permanent marker, □ determine a relative pose between the AR-device and the permanent marker, □ visually detect and identify the temporary marker by the coded design, □ while the permanent marker and the temporary marker are both situated within the field of view of the camera, determine a relative pose between the permanent marker and the temporary marker, and □ based on the determined relative pose between the permanent marker and the temporary marker, define a pose of the temporary marker relative to the coordinate system, and wherein the AR-device is configured to, when a user is close to said location to perform the operation so that sight of the permanent marker is lost and the camera has only the temporary marker in its field of view, □ determine a relative pose between the AR-device and the temporary marker, and □ based on the defined pose of the temporary marker relative to the coordinate system and the determined relative pose between the AR-device and the temporary marker, augment a view of the coordinate system with an AR element (20,40,41) on the display. □ determine a relative pose between the AR-device and the temporary marker, and □ based on the defined pose of the temporary marker relative to the coordinate system and the determined relative pose between the AR-device and the temporary marker, augment a view of the coordinate system with an AR element (20,40,41) on the display.