HI-TACAN approaches are not drawn to scale within the entire plan view area. The scaled area of the plate is contained within the solid ring.
Scaled area in the plan view portion of a HI-TACAN approach procedure
Outside the scaled area, the aircraft's GPS position will be shown, but its location will not be to scale relative to the navigational elements depicted. Once the GPS position is shown within the scaled area, then navigational elements within that area will be to scale relative to the aircraft's location.
Additionally, runways are not drawn to scale on HI-TACAN approach plates. Only the approach end of the intended runway is shown in the proper location. The rest of the runway is expanded to show the relative position and for ease of visibility.