This is about as simple as it gets this side of steam but it does have a backup. The GRT Sport for everything you need to know and the Trio to get down, around or through 1000/3 summer time haze.
EIS 4000 is reliable as anything so long as there is juice in the battery.
Beyond that, it is a VFR panel in a VFR airplane and is eye balls and ears for sight, sound, and feel.
Any more panels of glass in a VFR airplane just clutters things. KISS. I'd rather have a new pick up.
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