GoreTex: Used almost as a colloquial term for a waterproof and breathable jacket. Gore-Tex® Fabrics, developed by W.L. Gore & Associates, have an ePTFE membrane that is laminated to different face fabrics to produce cloths that are waterproof, windproof and breathable. Gore-Tex® Fabrics can only be used by licensed manufacturers.
GPS: A satellite navagation system and an acronym for Global Positioning System (GPS).
Grommet: A metal, reinforcing eyelet on the outer edges of tarps and tents, through which rope or other fasteners are passed to secure the edges, or eyelets to hold the ends of the tent poles.
Groundsheet: A tarp or sheet of thick plastic which is placed on the ground beneath a tent to protect the floor from being punctured by jagged rocks or small sticks, also known as a "footprint."
Guy-Line: A rope used to anchor tents and portable shelters to keep them from being blown away in the wind.