I don't think an IR examiner would allow me to whip out a CRP-5 or an electronic version. Taking a 330/30 wind and tracking 360 degrees. Max drift would be 15 degrees, single drift 7 degrees and ground speed about 93 knots from a TAS of 120 knots, giving you a heading of 353 degrees. From my RMI and DME, how would I be able to see that the headwind of 27 knots comes from a wind from 330 degrees and 30 knots strength, and not from a wind further to the left, say 310 degrees, but of greater strength. This wind would also give you a ground speed of 93 knots, albeit the single drift heading would also change to 346 degrees.
Clearly I don't want to tie myself in knots up there but there is only one wind from a certain direction and of a certain strength that will give you a certain single drift and a certain ground speed. If someone can say to me......"okay first look at your single drift......blah blah.....then take your ground speed and do this....blah blah".......which will allow me to tie this wind down to an exact strength or direction, or say " you cannot work this out without a CRP-5", or even " you cannot work it out exactly at all", then, fair enough, I'll guess I'll either have to fly what I planned based on the forecast or "wing it".
What is everyone else outwith the air data computer (and the magenta line chasers) world doing?