Gums et al , may I commend to you ' Longtitude ' by Dava Sobel . ISBN 1-85702-502-4 . USA publisher Walker Pub. Co. UK one is Fourth Est. Ltd.
Dedicated to her mum .. ' A four star navigator who can sail by the heavens , but always drives by way of Canarsie ' .
Before 'pooters , I always meant to write her ; to let her know we navigated over the pond using INS ' Triple Mix ' . [ which relied on a microchip clock , I think ] but also ' drove by way of Canarsie ' to get onto Rwy 13 L/R at JFK .
Fascinating thread , please keep tales coming .
rgds condor .