Ultra trac mode when hiking?

Why don’t you just grab a power bank with you to charge it up at the end of the day? Just a suggestion. 

Which 6 series watch do you have?

How long will you be hiking each day? 

Travel light. Always good with a power bank but just want to have less stuff with me.

6-8 h per day. I have the 6 pro

I took a 6 solar pro for a four day hike a couple of months ago with no access to power. Close to 25 hours of GPS+GLONASS activity over those four days. Saved the activity and stopped the watch at the end of each day. Still had close to 20% battery left. Since the weather was overcast and cloudy there would have been little added from solar charging.

The 6 Pro specs have GPS run time of about 36 hours of GPS tracking - this should comfortably handle 3 x 8 hour days of hiking. Ultratrac involves some significant compromises for GPS accuracy, so probably best avoided unless necessary.

That said, the settings do influence power consumption significantly, so you want to look at the Power Manager settings for hiking. Minimalist options can potentially extend GPS life beyond 36 hours.  Specifically I would suggest:

* GPS only, rather than GLONASS/Gallileo
* Disable music
* Disable PulseOx
* Disable the phone connection.
* Enabling the display timeout (this is a little more extreme, but can add to battery life over several days of use)
* Once you are finished hiking for the day, enable the Battery Saver mode overnight.

Other suggestions to maximize battery life that are not part of Power Manager include:

* adjusting the backlight settings (minimizing brightness, and shortening the timeout, 
* not having the map as your active display. Constantly re-rendering the map as you move along is processor and battery intensive. Have a data- only display as your main display, and just scroll to the map screen when you need to do a navigation check. I have my hiking screens set up so I can access the map with a single button press.

Enjoy your trip!

Thank you all

I advise just to get a small powerbank and use the watch with full functionality. I don't know why I payed so much money if I won't use the maps or other features.
In my long hike in summer I got a 10 watt solar charger and 26 thousand mAh powerbank. I put the solar charger over my backpack and it charger my powerbank all day. Later I charged both my watch and battery sucking phone whenever I wanted.

I have a 73w power bank from Celestron.. maybe i bring it. It's only 0.63 kg. 

Perhaps it's a good alternative. Good for security reasons to have a charge phone. 

I agree. The same small power bank which could recharge your phone once, may recharge your watch 10-30 times, depending on its capacity. You must want to travel super light to refuse that. I always bring one just in case for either watch, inReach or phone.