Patent ID: 7301469

Claim:
A trail marker system comprising: a portable signal transmitter that transmits an activation signal; a plurality of illumination devices, wherein all of said illumination devices activate when said activation signal is received from said signal transmitter, wherein each of said plurality of illumination devices includes: a housing having a solid rear surface and an open face, wherein said housing defines an interior having a volume of less than one cubic inch between said open face and said rear surface; a circuit board contained within said housing, said circuit board containing a signal detector and at least one LED oriented toward said open face, wherein said circuit board causes said at least one LED to activate when said activation signal is received by said signal detector; a lens element covering said open face of said housing, wherein said signal detector and said at least one LED are confined under said lens element in said housing; a spike extending outwardly from said rear surface of said housing, wherein said spike is configured to selectively pierce a tree, thereby joining said housing to the tree.