The only was to set your 'throttles' is to set the speed on your dial in the lower right of the screen. A given speed (usually between 7 and 8 knots) will give you the best endurance - if you go too slow your range will decrease.
As long as you set your desired speed to the most economical setting you will get the best range out of the boat but do not be surprised if your actual speed is less than the desired speed.
This is most easily seen in bad weather when your grey (requested speed) needle can be one or two knots ahead of your black (actual speed) needle.
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