I also started my first Camino in 2006.
1. 2006
Camino Frances - Nokia phone 1 megapixel camera, alarm to wake me up, roaming so minimal use (a couple of overseas texts home to let them know I am fine)
2. 2007-2008 Camino Primitivo/Camino via de la Plata - Nokia phone 2 megapixel camera, alarm, Paulo Coelho's ebook Pilgrimage to read, wifi, blogging, Skype with wifi from library for communications home.
3. 2012 Camino del Norte - *** This is the turning point. iPhone 4, Maps.me app with offline map of Spain, local SIM card with 850 meg data for 30 days. Know where I am all the time without incurring data charges, location based on AGPS (mobile cell tower) and when I lost cellular signal it switches to GPS.
4. 2014-2015 Camino Levante - Same Maps.me app with offline map of Spain, local SIM card with 2 GB data for 30 days this time with Asus Android phone. Using internet Whatsapp to communicate with home either via text or voice. And blogging.
5. 2016-2017 Camino Vasco/Camino del Madrid/Camino Mozarabe - Same Maps.me app. New Android phone. This time Maps.me supports kml overlay. Found overlay for all the above Caminos. With the offline map and also the overlay line even much harder to get lost.
* Maps.me update for 2017, for any plotted path you get and elevation chart too.
** As for weather, I was warned by the weather app on the phone's main screen of level 5 high winds the day before I ascended the tunnel on the Camino Vasco. Rain warning and literally every day a UV warning by 9:30 am.
*** There is a post on the forum on where you can download almost every Camino kml overlay.
**** GPS watch is another device that needs to be charged every day. Try to keep it simple and only charge 1 device (phone). Screen is too small too.
You can do all that and more plus much cheaper with just a phone. Any unlocked Android phone even the budget ones ($100) can do the trick. Maps.me is free. Offline map is free. Overlay is free. Just the phone and a 2GB 30 days local SIM with 10 Euros of talk time for 15 euros (2017 price). You can even a Camino app (if there is one for the Camino you want to walk) or save the pdf guide on the phone to save weight (suggest a couple pages of a summary paper guide as a backup).
In short, I find it very refreshing for me since 2012 that I can deviate from the route and back again easily. With the overlay I can even walk backwards on the Camino Mozarabe (Granada to Cordoba and back down to the other alternative fork to Malaga) without fear of getting lost.
Again, as with the others, I will be interested to see what will be your decision (if it is a watch).
By the way, if you are still interested in the old school barometer sensor on a device instead of a weather app, some LG phones do have built in barometric sensors, cheapest would probably be the LG G4 (released in 2015). About $193 dollars at Amazon (AT&T since they uses SIM card) without a service contract. If you are from the UK it cost slightly more.
https://www.amazon.com/dp/B00XMGSVKK/?tag=casaivar02-20