What are the Radarless approach control services in the United States? I was recently in Twin Falls, ID at KTWF. There is no radar for approach control services. All instrument approaches are full procedures and aircraft must report all requested fixes.
There is Salt Lake Center radar services at altitudes well above the usual approach and landing phase of flight for KTWF.
When I remarked to tower that is old school, they stated &quot;last of two in the country.&quot;
What is the other?
Twin Falls, ID
Helena, MT

The Chart Supplement shows if a facility has radar or not. The entries for KTWF and KHLN show that there's no radar at the local TRACONs.