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Author Topic: Cave marker?  (Read 303 times)

Offline MG Toad

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Cave marker?
« on: February 24, 2019, 06:30:05 am »
Hi
I have recently returned from a caving trip in Spain and noticed small blue circular discs a few mm thick attached near the cave number plates.
Does anyone know what they are? Are they some sort of smart marker? I have attached a photo
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Offline Antwan

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Re: Cave marker?
« Reply #1 on: February 24, 2019, 07:23:38 am »
They look like RF id tags, scan them with compatible devices (most smart phones) and they share a small amount of data.

Purely speculation but it could be the website link for a survey or visitors book? Would be nice to know exactly how they are been used  :thumbsup:
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Offline MG Toad

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Re: Cave marker?
« Reply #2 on: February 24, 2019, 01:02:33 pm »
Thanks for the info - very interesting
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