Directional marker
A directional marker was an object left behind as an indication of the direction in which one had gone.

In 2269, Montgomery Scott followed the directional marker of James T. Kirk and Spock with a small hand-held device that pointed towards an underwater fern bed. ()

Jean-Luc Picard left a directional marker when Wesley Crusher and him crash landed in the Nenebek along with its captain Dirgo in the desert sand of Lambda Paz before they made their way to shelter. When the  found the downed craft, the marker led them to their location. ()
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