His Boating App Needed a Boost. His Daughter’s TikTok Audience Came Through. Jeff Foulk spent years working on Argo Navigation, a GPS app for boats. After a TikTok video, it became one of the App Store’s most popular products. Jeff Foulk spent four years creating his version of the perfect boating app. By his own estimation, he spends 80 to 100 percent of his time retooling and reimagining the GPS app, Argo Navigation. He made it easy to use. He color-coded routes based on depth.