Disco , sorry to disagree ... 12 yrs on Trids , Doppler map pretty good ... didn't like calm seas , or if you brought the wrong roller strip map !
Needed a reset every now and then from a VOR/D , and would not have used it for an approach . Doppler drift and G/S from same source also V useful .. especially on instrument apps . Consol still pretty good up and down N.Sea when too far from Dover or Kristiansand . Seem to remember 212 DME max.
B732s with Doppler drift and G/S not so good , rumour was they were cheap and for helos [ max speed 200kts ] .
GPS v good for detail , car or a/c .. map/chart for big piccy , with N up !
rgds condor .