Free app for iPad, iPhone and Android for nautical charts. Weilbach offer you two free navigation apps. Produced by respectively KartenWerft and Klasing. Both are combination product - meaning that paper charts and digital charts are combined into one product. You download a free app on your iPad, Android or Windows mobile device. You purchase your charts for the free app here. You will receive a set of paper charts for the area and on the paper charts there is a unlock code for the charts in your app. Purchase nautical charts for the free app for iPhone, iPad and Android. The products enable you to combine paper charts and charts on your mobile device.