Dru Posted August 22, 2002 Share Posted August 22, 2002 And here is the beast! Quote Link to comment Share on other sites More sharing options...
cj001f Posted August 22, 2002 Share Posted August 22, 2002 quote: Originally posted by jon: I really doubt they have motion sensors up there. Most of the detectors I've seen haven't been true motion sensors - they have "intrusion/pass" detectors that record everytime the beam is blocked. You cna always tell these because there's a mirror on one side of the trail - and the light source on the other side. I've seen them in National Parks, and in State Parks(CA) - often times if you go check out the back of the sensor they have a rolling counter that shows how many times it's been triggered. Now the border problems has a whole suite of intrusion detectors (the Mexican one definitely does). Carl Quote Link to comment Share on other sites More sharing options...
Dru Posted August 22, 2002 Share Posted August 22, 2002 tape a mirror over it? Quote Link to comment Share on other sites More sharing options...
cj001f Posted August 23, 2002 Share Posted August 23, 2002 quote: Originally posted by Dru: tape a mirror over it? Or a piece of black tape. My favorite Idea was to put a chopper wheel in front of it - really screw up there numbers! Carl Quote Link to comment Share on other sites More sharing options...
Jens Posted August 23, 2002 Share Posted August 23, 2002 There used to be one of those motion counters up at exit 38. As you walked on the gravel road toward the trail leading to the cave etc,. it was on your left. On the topic of technology, some of the NPS staff in Yosemite have used night vision goggles to patrol the valley at night (find bandit sleepers?) I've been roused once at dawn for bandit camping down there. Quote Link to comment Share on other sites More sharing options...
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