Section (e) List the elevation and DME/GPS dista - Manual of Standards Part 173—Standards Applicable to Instrument Flight Procedure Design - (e) List the elevation and DME/GPS distances of terrain and obstructions in descending order within the tolerance areas, commencing at the point where descent below the LSALT first becomes possible. In the calculation of obstacle heights, additional clearance should be made for chart error, mountainous terrain, vegetation and built-up areas. | Zoe