FAA safety briefing Fly the Aircraft First!
https://www.faa.gov/news/safety_briefing/2018/media/SE_Topic_18-07.pdf
NTSB accident data suggests that pilots who are distracted by less essential tasks can lose control of their aircraft and crash. It is essential to maintain aircraft control at all times. This may mean a delay in responding to ATC communications and passenger requests, or not responding at all unless positive aircraft control can be maintained throughout.
In other words, Fly the Aircraft First!
Unmanaged distraction can also result in navigation error, Airspace Infringement and MAC, CFIT, etc.
See also the EGAST leaflet 7 https://www.easa.europa.eu/document-library/general-publications/egast-leaflet-ga-7-using-advance-navigation-technology-safely and Airspace Infringement | EASA.
Best to all!
Michel
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General Aviation