Relying on where seekers search and the season, late period searching can be cold, sometimes bone-chillingly so. Staying warm during these pursues boils down to handling moisture, since vaporizing sweat speeds canvas tarp up heat loss. One means to do this is by utilizing a range jack.
A cooktop jack is a small opening or vent built into certain camping tents that lets hunters pipe in the heat of a wood-burning oven inside their shelter.