NEW YORK (AP) — Outside magazine tested dozens of iPhone programs for outdoor adventures and settled on these five as the best apps, as described in the October issue:

—Google Earth, a free program that offers 3-D views, navigation and detailed high-resolution imagery.

—Topo Maps, $5, recommended as the cleanest of GPS-enabled U.S. Geological Survey topography applications, allowing you to easily plot your location.

—iTrailMap 3D, $5, which lets you track vertical distance and map a ski run, in real time, on a 3-D rendering of any ski resort in America.

—RiverGuide for Kayakers, $5, providing U.S. Geological Survey flow data for rivers.

—Surf, $5, providing Web cams, tides, and swell data for every major surf spot in the world.