Thanks for that Mr 'G',
A WAC, a ruler and a pencil.....and Oh yes...a Shell road map - it had more details of the roads 'directions and distances' than the ole WAC....
'Ephemeral lakes & rivers'..?? A series of somewhat 'vague' dotted lines...
And thankfully all of the roads of which we speak were dirt / gravel / dust...so we just looked for 'rooster tail' of dust to see where they were...
Funny how we used to arrive at correct destination, 'on time'...usually...
Cheers
