How a local surfer with a tech background created a global go-to for predicting swells The Mavericks Wave, near Pillar Point Harbor in El Granda. (Courtesy of Powerlines Productions) By August Howell This is the time of year when Mark Sponsler’s phone starts ringing and his website numbers begin climbing. “It’s really interesting. You watch the traffic on the website go from really sleepy during the summer to instantly, beginning around mid-August, start to ...

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