VRTool "SideKick" (VSK) integrates charting, sailing calculator and GPS data logger. It transforms your GPS enabled phone or tablet in a powerful sail boat racing tool. Now it brings most of VRTool desktop charting features, packed in this mobile app. Key data components used by VSK in charts and calculations include: - GPS position ( or you can type coordinates ) - GSHHS world maps - Polar chart for your boat ( customized ). - NOAA GFS wind forecasts. VSK shows the current polar line, TWA,