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Are you ready for the total solar eclipse on April 8? Click to shop all solar gear!
Are you ready for the total solar eclipse on April 8? Click to shop all solar gear!

What is the JRH switch for in the ExploreStars Settings/Preferences for?

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The JRH switch is a test feature that has been included in the most recent versions of the app and is still being evaluated. You can safely ignore it.  You should disable the switch if it is not already disabled. The switch involves using the Explore Scientific PMC-Eight Command Language as detailed in the “PMC-Eight Programmer’s Reference”.