I looked at some of the other smartwatch threads, and being that they were older, they don't cover the following two cases:
- Hybrid Smartwatches
- Sports watches
First the assumptions / definitions
I assume that you are in agreement that a regular, battery powered watch, with an always on screen is okay to wear on shabbat
For this discussion - a "Hybrid Smartwatch" is a regular date/time watch, but has a sensor within it that tracks your steps - this sensor doesn't have a display, and the information is only available to you, if you sync your phone with the watch.
A sports watch (for purposes of this discussion) is a watch that has the following features: a) The screen is always on, b) it may have GPS and/or Heart rate measurement - but this only operates when you press a button to go into 'workout' mode, and c)It tracks steps, but doesn't display them on your screen
So now my questions: - Can either of these watches be used on Shabbat? What modifications would need to be made? (or is the fact that they're tracking steps make them prohibited off the cuff)?
-In the case of the Hybrid Smartwatch, would it make a difference if you never sync your phone with it?