Whats best hiking GPS settings?

Ive had the 5x since launch and I love it. One thing that I find is my distance is a little longer than it should be. Yesturday I did a 7 mile hike and it read 1 mile longer by the end. I have GPS+Glonass and I got to thinking..maybe it keeps recording when I stop for breaks and adds that distance? What have ppl found best for their settings?