A publication of the National Air Traffic Controllers Association
Issue link: http://natca.uberflip.com/i/862302
• Scale, s ize , and l ayout of c hart c ontingent on e xtent of c overage and c omplexity • If n ot p ossible to d raw e ntire chart to s cale, then n ot - t o - s cale i nsets r equired • Information in i nsets is d epicted s chematically is N OT drawn to s cale NOT - TO - SC ALE (NTS) INSETS • NTS Insets are NOT Geo - Referenced • NTS Insets do NOT include Terrain Data or Topography • NTS Insets do NOT Support Own - Ship Depiction (when available, otherwise) TRANSITION BETWEEN TO - SCALE PLANVIEW & NOT - TO - SCALE INSETS Difficulties have b een attributed to user habits related to Electronic Displays, namely the tendency to "Zoom - In" to a part of the chart, then being surprised when encountering the border or neat line around the NTS Inset. Where Flight Tracks are involved, some pilots have reported difficulty or confusion when visually transitioning between the To - Scale portion of the chart Plainview and a Not - To - Scale inset, or vice - versa. NOT - TO - SCALE (NTS) INSETS – DEPICTION ISSUES Depiction considerations attributed to electronic displa y "Zoom - In" Phenomenon Fix Labels & Text: along the edge or border of a NTS inset, for Fixes located inside an inset place I n dent, Labels and related Information Text inside the inset. Inset Label: along the edge or border of a NTS inset, increase the Siz e and Location of 'NOT - TO - SCALE' inset label and position the label closer to the Flight Track vs. in an open area along the border. Inset "Sided - Ness": along the edge or border of a NTS inset, indicate which Side of the inset outline is Not - To - Scale vs. the To - Scale side of the Plainview. I nset Flight Track: along a Flight Track, which extends from a NTS inset to the To - Scale portion of the Plainview, indicate with a Symbol and/or a physical "Break" in the flight track where the track crosses from the In set into the Planview. GEO - REFERENCE & OWN - SHIP DEPICTION Some electronic chart display systems are able to automatically recognize the difference between areas of a chart drawn To - Scale vs. Not - To - Scale. For example, one major avionics display provider' s system cannot make the distinction. Representation of Own - Ship position in a NTS inset is incorrect and misleading. The affected OEM is looking to Jeppesen so solve the problem by modifying the chart files instead of modifying their operating software. HOLDING PATTERN DEPICTIONS - INSETS Existence of a Holding Pattern is Normally shown as a Symbolic representation (not true to size) at the applicable Fix location in actual Orientation