Of course, these are *minimums*. When I looked at the my L-1/L-2 enroute chart, I can see that some of these that were set to 20 NM, have published victor airways that force them to be longer.

For example, Fortuna (114.0), up near Arcata, CA, seems to require reception to not less than 55 NM to the South in order to reach (JENNI) to intercept Menocino. V195, heading East, requires a similarly long 50 NM length.

And even worse, Williams (144.4), a published route (V200) that *requires* a change-over clear out at 84 NM (which requires looking at enroute L-9 just west of Reno to find)!

Each of these had 25 NM in the nav.dat, are categorized as low (and hence should have a 40 NM service volume), but actually have *much* bigger service volumes.

At this point in time, I’d expect that the priority would be given to published victor airways so that IFR navigation can be practiced. As such, Robin is increasing the ranges of the ones I report, but it would seem that the airway data could be utilized to help determine necessary ranges.