Property line

I just purchased 80 acres. It's 1/4 mile by 1/2 mile. About 1/2 of the back line is already wired off on the property line. I would like to cut a trail down the rest of the back line however it's extremely thick . I definitely don't want to wind up on the neighbors property. I can mark the corner and the other part that's wired however I'm trying to use a handheld gps and it's going poorly. Loosing signal and it just doesn't seem to be reliable. Any tricks for finding the rest of the line. I thought I would just be able to cut the already marked part and just sight a line down it however that's easier said than done. Just going around a couple bigger trees pretty much ended that. Yes I know I could just pay a guy however I just purchased 80 acres lol

Property line