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Optimum settings for ultra distance like UTMB

Hello,

I'll be running UTMB end of this month, and I wanted to know the optimum settings to make sure the watch lasts the advertised 36 hours in GPS mode. 

I've done some tests and never really reached the advertised 36 hours in any of them, not even close. The best result was around 25-26 hours. 

Below is my setup:

1- Wrist HR: ON

2- Plus OX: OFF

3- Bluetooth devices:  Stryd for better pace/distance accuracy and to also measure power

4- Vibration: OFF

5- Backlight is set to 5% and 8s timeout

6- No auto laps every 1km, I'll be using lap button to mark a lap between aid stations

7- No auto-pause

8- GPS+GLONASS

9- I don't use maps, and barely touch the watch during workout, I only look at the main screen

10- ClimbPro: ON

11- Alerts: None

12- Auto Scroll: Off

13- Segment Alers: Off

14- Power save Timeout: Normal

With the above settings I did two tests: 

- 9 Hour trail run: consumed around 50% (during this run ClimbPro was activated on the climbs to show elevation gain)

- Daily runs in the city: around 4% per hour.

I need to get this 4% to 3% to reach the advertised 36 hours without sacrificing GPS accuracy/ Wrist HR and of course with Stryd connected.

Any ideas are more than welcome

Thanks,

Ismail