"Waymarking", which is defined as mapping a prominent physical feature, landmark or route. A similar concept is "Geocaching", defined as hiding or mapping a tangeable object. Typically a Geocache or Waymark position is recorded as a set of GPS coordinates. The concept of Geocaching has been around since the dawn of mankind, however GPS technology has expanded interest in this hobby, even to the point of obsession for a few. There are millions of documented Geocaches, which are usually a piece of hidden tupperware with some type of treasure or infomation inside. The Geocache is usually hidden or even burried in a remote wilderness area and then its position marked with a GPS and recorded as part of a Geocache archive. Usually the seeker of the Geocache is more thrilled by the hunt, and then the actual discovery than by the contents of the Geocache, which typically are left in place for another seeker to find. Geocaches marked with older, less accurate GPS systems can be quite a challenge to find.

By definition, Geocaching certainly includes GPS tagged "Landmark Trees" which are litterally "hidden treasures" in every sense of the word. Before 1991, there were a total of 6 coast redwoods (sequoia sempervirens) known to be taller than 350' and the largest known coast redwood was thought to be Stout Tree, only 21,000 cubic feet trunk volume. As of today there are at least 200 coast redwoods known to be over 350 ft (106.7 m) and 14 coast redwoods known to be over 30,000 cubic feet in volume. These exceptionally tall and large redwoods are both "hidden" and they are "treasures" due of their awe inspiring size and age. Also contained within their mass a wealth of potential scientific information. The knowledge gained from studying these ancient trees could potentially benefit mankind in a variety of ways. For instance, the effects of carbon loading from the industrial revolution on redwood growth over the last 150 years have clearly been shown in tree ring studies by Steve Sillett and his colleagues. Potential threats to the species could in theory be mitigated over time by altering how much carbon we pump into the atmosphere

The Tall Trees Club actively maintains and updates a GPS archive of world's largest and tallest trees. This includes every single living redwood 350 ft (106.7 m) or taller and every single redwood with a trunk volume documented as 30,000 cubic feet or larger. If you browse this website, you will see occasional Google Earth icons here and there. By clicking the icon you will launch Google Earth in your computer with an aerial view of the landmark tree. You can store this waypoint by saving the current application in the file menu. Whenever you launch Google Earth, you will see all your previously stored "Geocaches" in alphabetical order.


If you want to accurately mark or find trees with GPS in a dense forest, you will be wasting your time unless you have a unit with a high-sensitivity, WAAS-enabled receiver. Even better is a GPS with the new "SiRF" receiver & chipset. The Tall Trees Club uses & recommends the following GPS models for dense canopy work:

SiRF Chipset & Receiver- By Far The Best Choice:

November 2009 or newer Garmin CSX60, CS60 or 76CSX

High-sensitivity, WAAS-enabled receiver GPS - 2nd Best Choice:

DeLorme Earthmate PN-30 or PN-40 (nice maps, bright screen)

High-sensitivity, WAAS-enabled receiver GPS - 3rd Best Choice:

Garmin Colorado 400t (battery hog, dim screen)