For tree work, it's my echo 2511t. For surveying work, it's Terence my war axe...
Why's it named Terence? All war axes need a name, and Terence is a hilarious name for a war axe :^P
I found it looking for a control point ~20 years ago. Got a hit with the metal detector, dug down, and found the axe head. I cut the handle down so the whole thing's 18" long, but I recently got a short full size handle from the Amish hardware store that has the deerfoot, though it's uncertain if I'll ever use it. Depends if this one wears out. I've looked for something like that forever. It's only semi sharp. Good enough for breaking roots and stuff. It gets "sharpened" when I use it to scrape pavement. It's been beat and abused, but it keeps on kicking ass. I love that axe.
I wish i had an older one, maybe this year I'll find one. The older ones are better, more and more copper in the windings. In case you were wondering, yes that's the machine i weld pipeline with, it's a working machine.