My dad, Roger Easton, invented GPS. See my website www.gpsdexlassified.com
That’s pretty cool. Your dad has a Wikipedia page.
https://en.wikipedia.org/wiki/Roger_L._Easton
Looks like a fascinating book!
Fascinating fellow. I asked him a lot of questions about the GPS after he mentions what he had done when I asked him what he had done before retiring.
I spend a lot of tie in the boonies, in our Unimogs, on our Rokon Trailbreaker and Skidoo Expedition.
I use all available sources of information about where I am going.
Books, GPS, Topo maps,both modern and old, any other paper maps or online maps I can find.
The more info the better.
On the trail I use GPS and folding maps.
If in the Unimog(s), laptop computer with DeLorme GPS receiver and topo maps, sometimes satellite images.
Ham Radio APRS at times too.
Thank-you for letting us know. FR’s connection to history never ceases to amaze me.