Strange Map Symbols

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   What are these light green colored circles and rectangle on the IFD 540 FMS map?     They appeared and then disappeared a few minutes later.  I musta been asleep when Avidyne training videos discussed these symbols.

Edited by AviSteve - 20 Jan 2023 at 11:01am

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MarcDMcD Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 19 Jan 2018 Location: Central Texas Status: Offline Points: 15	Post Options Post Reply Quote MarcDMcD Report Post Thanks(0) Quote Reply Topic: Strange Map Symbols Posted: 19 Jan 2023 at 11:05pm
	What are these light green colored circles and rectangle on the IFD 540 FMS map? They appeared and then disappeared a few minutes later. I musta been asleep when Avidyne training videos discussed these symbols. Edited by AviSteve - 20 Jan 2023 at 11:01am
	McD

AviSteve Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 12 Feb 2018 Location: Melbourne, FL Status: Offline Points: 2279	Post Options Post Reply Quote AviSteve Report Post Thanks(0) Quote Reply Posted: 20 Jan 2023 at 11:00am
	Those are areas around airports where terrain awareness is inhibited. In version 7 of the pilots guide, they are described on page 4-32. In version 8 (the 10.3 version), they're described on page 4-44.
	Steve Lindsley Avidyne Engineering

dmtidler Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 12 Feb 2016 Location: USA Status: Offline Points: 619	Post Options Post Reply Quote dmtidler Report Post Thanks(0) Quote Reply Posted: 20 Jan 2023 at 11:27am
	Those appear to be the FLTA runway suppression areas around the three paved airports shown in this screenshot. The three private airports have circular FLTA runway suppression areas because their runway directions are not defined in the nav database. The runway at the public 1T7 airport is in the database and that leads to the rectangular FLTA runway suppression area. It appears that the IFD airport filter is being used to not show the actual airports. The IFD airport filter does not appear to filter out FLTA runway suppression areas around airports that are being filtered from display on the IFD map. The FLTA runway suppression areas only display within 10 NM of the aircraft's position and altitudes within approximately 3000' AFE.