Thank you all for your suggestions: it is appreciated. Not sure about smoke signals !!!
I forgot to mention a couple of things:
- I don't have a cell phone (I will probably be the last person on this planet to have one). Whatapp look promising but I need a cell phone for it...so not a good option
- I have an iPad mini, so I can connect on free wifi (hoitel, restaurant, etc)
- Will do camping when ever possible
- I have a dyno hub and a solar panel to recharge my iPad, lights, powerbank, etc... Plus I can recharge at restaurant, hotel, etc
- My tour will start in the USA (Texas), Mexico, Guatemala, ... up to Panama
- Most of my family have FaceBook
Trackmytour and Strava look promising also email makes sense at some occasion.
Thanks!