Thanks for pointing out OSM.

I used navigation as an example. In general though I really don't get the idea of wifi-only table. I commute regularly and get most of my non-coding work done during that time; e-mail, responses, catching up on news and a whole bunch of things. Also when I'm out I carry my tablet around, just in case.

And I have a dumbish phone which I use for making/receiving calls :-)

Instead of upgrading my phone to 4G, I bought a 4G hotspot, and now everything talking wifi can use it. Count as an advantage that this way no hijackable baseband processor is running inside your tablet, and as a disadvantage that now also entities that only track wifi MAC addresses can track your movements.

(Also an advantage over using the phone for data is that by using a data-only SIM, your ISP won't do some nasty stuff like blocking VoIP. In the end, I may go back to a dumbphone, too.)

Get an ultrabook like the X1 carbon (v1) or Macbook air, not a tablet. I use the carbon to code on my commutes (and stream music) and it's perfect.

I think Jolla has HERE maps as well, which would make sense given the history of the companies.

Yes and no. The default map app on Jolla does use the HERE maps data set, but doesn't support offline maps or turn by turn navigation. However the Android app is confirmed to work: http://www.thejollablog.com/here-maps-jolla-sailfishos/

Thanks for the clarification.