It would be good if any custom waypoint would have the option to "pop up" a user-supplied message/alarm when the user approaches that waypoint (gets within a specified radius). This option should be accessible via the map or the Flight Plan. To make it maximally flexible, allow this option for any waypoint (whether custom or not). E.g. an airport
Examples:
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Examples:
- A fly-in requires that you make a radio call at xyz location, so you set up a custom waypoint centered on xyz and specify that when within 5 miles of that waypoint a message box appears that says "Give aircraft type/color on 123.45".
- You're a low-flyer, and you know there are wires crossing your route at xyz, so you define a custom waypoint that pops up the message "East-West wires across river at 50 ft" when you get within 2 miles of that waypoint.
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