LOU wrote on Jul 1^st, 2011 at 6:21pm:

BrianG, you asked how to get ground speed from looking at the DME readout. If you start your stop watch and look at the DME see how many miles click by in one minute. If you see 10 miles go by in one minute you're doing 600 KTS.  All you need to do is take the miles that click by in one minute and X by 60. For example you see 7.5 miles go by in one minute: 7.5 X 60=450 KTS. Poor man's G/S readout.  ;D Lou

As an addition to Lou's info, using time-speed-distance, any two will give you the third. You can also still buy a 'wizzwheel' (E6B) which will help with that as well as a lot of other things, if you REALLY want to get 'real'.

Time to park the 757 and get back into the 707 for awhile, Lou's posts have that affect on me!