Which of the following would give the best indication of speed?
a. A VOR on the flight plan route
b. A VOR off the flight plan route
c. A DME on the flight plan route
d. A DME off the flight plan route
a. A VOR on the flight plan route
b. A VOR off the flight plan route
c. A DME on the flight plan route
d. A DME off the flight plan route