This App is especcially designed to measure and display accurate lower speeds, also when travelling over open water with less GPS points. The screencolors are choosen so it stays visible on bright sunny days. It will automatically ask to turn on GPS and Internet otherwise it don't work. We use it ourselves on bright sunny days trying to improve our Stand Up Paddling Speed on the water, measuring the effect of changing our paddle technique. Ofcourse you can use for other activities as well. Disclaimer: We don't take any responsibility if people damage their phones from humidity or if they drop them into the lake/ snow. We don't take resposibility for accidents (example skiing into trees) or for getting traffic fines (using it in cars).