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That's good info about UAT above 18k, but if you're that high anyway, you'll be IFR and under normal traffic separation rules, so I wouldn't be too concerned about not seeing 1090 equipped traffic. Many of us use a portable 1090/978 in unit for weather and traffic to display on our tablets, so at least there's that. I'm not familiar with "basic 1090" - I guess that would be a 1090 equipped aircraft without ADS-B? I wouldn't imagine there would be many of those around.
Fun fact - Class A airspace used to be called "Positive Control" airspace (IIRC), and it started at 24k, not 18k. So for the longest time you could fly VFR right up to 23.5k.
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02-18-21, 05:00 PM
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