Hello!
‌‌I like the trajectory line feature - especially the 2/5/10 unit indicators.
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‌But I really recommed to include an additional line option as well. It should be very thin line variant which shows only the actual flight direction - from the plane over the complete screen (no matter how the current zoom level is). See attached picture. The benefit could be to have this orientation feature a bit more discreet due to the fact that we all have a lot of details on our moving map to consider during the flight. 
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‌Marc
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