Orientation system for downhole device

Orientation system for downhole device, wherein the orientation system comprises an outer magnetic orientation lock assembly arranged in connection with or integrated in the downhole device and a retrievable orientation instrument assembly for insertion into the outer magnetic orientation lock assembly, and wherein the retrievable orientation instrument assembly comprises a sensor assembly and a magnetic instrument alignment assembly arranged to the sensor assembly, wherein the sensor assembly is rotatably arranged in the retrievable orientation instrument assembly and wherein the magnetic instrument alignment assembly is axially aligned with and spaced apart from the sensor assembly and they rotate as one unit, wherein the magnetic instrument alignment assembly is aligning or orienting the sensor assembly according to the magnetic field direction of the outer magnetic orientation lock assembly and locking the position of the sensor assembly in this position for measuring the orientation of the downhole device.