Unusual: Using Helium to Track Paragliders

It’s a warm sun­ny day just west of and about 1,600 feet above Lake Elsi­nore, at a paraglid­ing launch site unimag­i­na­tive­ly called “The E”. A few of us are get­ting ready to huck off the steep face of the hill to ride ther­mals and the wind. Our plan A today is to see if we …

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