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[quote=Anonymous][quote=Anonymous]What does it mean that the help requested visual separation. What other options were available?[/quote] In airspace like this, there is an option for ATC to provide separation services based on radar. For example, this is how ATC keeps airplanes apart when they are in clouds and can't see each other. They would have to take into account the stack up of tolerances allowed in altimeter, transponder, timing of the radar pings, and more, so it ends up being a pretty conservative spacing. That's great for safety, but can be less efficient than the pilots simply seeing and steering around the other plane. The latter is what's known as "visual separation" - literally using eyesight to keep the aircraft separated.[/quote]
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