Why are some of the blue airport symbols missing on the ND?
This is a design limitation of the ARPT display mode in Precision Simulator 1.3. Although the missing airports may be available in the database, they appear on the Navigation Display only when the actual distance to the aircraft is smaller than ca. 80 NM. This affects only the ARPT mode (blue circles). Enroute airport symbols and fix info symbols etc. have no such limitation.