It's a drag to be "not on-line" these days. You miss out on lots of important information if you're not connected to the internet (important information like this presentation!). In our ARTCC network of radar sites, the problem of being "not on-line" exists, as all radar sites that have coverage into and along the edges of ARTCC airspace are not necessarily feeding that facility. Notice the radar sites that surround Cleveland Center that weren't hooked up when this slide was developed for my talk in '91. Take, for instance, the one at the lower center of this slide. That radar site is located in Higby, WV. A low-altitude aircraft on the southern boundary of Cleveland Center airspace near that radar site, being worked by a controller at Cleveland Center, is not afforded any coverage from that site because it is not even hooked up to Cleveland Center. This situation is very similar to my example given at the introduction page of this web site. In that case, the facility that was providing service to that Piper Arrow on its way in to Frederick was not providing radar service because the radar data of the site that could see the aircraft wasn't feeding their facility.
Since I left Cleveland Center in '93, I understand that two more radar sites are now feeding the facility. One of 'em, which I didn't depict, is in Cooperville, MI, and the other is the one in The Plains, VA. Higby ARSR is not yet connected. Nor is the one in Empire, MI. Nor is the one in Benton, PA.
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