On Tue, 30 Nov 2004 22:39:38 -0500, Roy Smith wrote:

Apparently, if you file IFR HPN - MMU, you get a clearance which starts
"CMK CMK275R SAX039R SAX" (i.e. fly outbound on the CMK 275 until you
intercept the SAX 039, then fly that inbound to SAX). In the good old
days of 2 VOR receivers, this is trivial to fly; the radios don't know
or care that the cross-radial fix you're going to doesn't have a name.
But, how would you fly that with a GPS?

I've been puzzling over that one for a week or so now, and the best I
can come up with is to use the GPS's OBS mode to track outbound on the
CMK 275, and set up a VOR receiver to indicate the crossing radial.

Can anybody figure out a way to set it up purely on the GPS? I'm using
a CNX-80, but it might be interesting to see how other units would do it
too.

The only way I know of to due it "purely" with the GPS mode would be to set
up a user waypoint at the intersection of those two radials.

But what I would do with my CNX80, assuming that was not worthwhile, would
be to also use it's VOR mode. I would set up an OBS track to SAX on the
039R. That should give a display on the screen. I would then use the VOR
mode to fly direct CMK and outbound on the CMK 275 until I intercepted the
course to SAX. Then I would switch back to GPS mode.


--ron