This is the main value of the watch to me. I like it as a standalone tool in the wilderness. I am not in the market for a phone peripheral. To me, the phone app is a peripheral to setup/maintain the watch and manage its data. But during hikes they are not connected at all.
I also really like the "course following" navigation on the watch and the customizable data pages. So I can have at my wrist a concise dashboard of timing, distance, elevation, ascent/descent, and upcoming turn guidance as I approach trail junctions. It's there at a glance.
I do also have mapping software on the phone for redundancy and other purposes, but the watch will get me to my destination on its own.
Though if you want to use your watch as a primary navigation device, you likely need to use LCD/OLED. eInk is not great for interactive map use, not a great use-case for Pebble.
For backup, I like carrying a Garmin satellite communicator. It has its own offline maps and a way to call for rescue in a pinch.
I was thinking about that, I like my iWatch logging my hikes.
But then I realized that I always have my phone with me anyway. And I already use a self-hosted track recorder ( https://github.com/Freika/dawarich/ ). So Pebble has one more order from me.
iWatch and the recent Android phones have some nifty features like fall detection and heart rate alarms, but their privacy and the ease of use are deteriorating.