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In page Geocaching:
"The second geocaching trackable in space is TB5EFXK[14] which is attached to the SHERLOC calibration target on board the Mars Perseverance Rover, which landed on Mars on February 18, 2021.[15] Geocachers were given the opportunity to virtually discover the trackable after the WATSON camera sent back its first photographs of the calibration target that contained the tracking code number. The code is printed on a prototype helmet visor material that will be used to test how well it can withstand the Martian environment. This will help scientists in creating a viable Martian spacesuit for future crewed missions to Mars.[citation needed]
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