Astrolabe found
 

anyone old enough to remember these.....

http://www.bbc.com/news/science-environment-41724022

Still got one in my chariot. Just need to work on an accurate timepiece, and a means of projecting a saved series of words, and we are away.

My hourglass would keep better time if I remembered to turn it over more often.

That reminds me, I need to find that middle sliding bit on my slide rule ...:wink: it doesn't seem to work very well without it ... :big_tongue:

My abacus still works.

I know I have kept my lodestone somewhere???????