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 Hi, 
 Being a Suunto Spartan Ultra, I only use the Suunto application.
 However, in the coming weeks I will be doing a 10-day trek and would like to know if it is possible to modify the GPS accuracy.
 In fact, I was unable to change the settings on the application and on the watch.
 How is this change possible ?
 Kind regards,
 Johan LOTH
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 I’m not sure if this is what you seek, but while in the screen that shows “START” in the watch, you can scroll down before starting the activity and find Options -> Power Setting -> GPS accuracy (as well as Low Color and Display timeout) 
 Those settings allow to save a lot off battery.
 And, of course, you can always charge the watch durind the activity with the cable and an external battery
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 Another thing. You can change gps accurary also on the fly, during the move, pressing & holdin middle button, entering in the option. A sort of manually power management in s9 style  
