QUID
Thanks that is a good guide.
I usually multiply altitude in thousands
by 3 when below 15,000ft and add to IAS.
Works fairly well.
ie at 6,000ft and if the IAS is 160
then TAS is pretty close to 178kts.
another quick x-wind check is
30 deg off heading mult wind by .5
45 deg = .7
60 deg. = .9
not too far off the mark.