Boulogne sur Mer, France Sightseeing Guide + Self-Guided Walk
How it works: Download the app "GPSmyCity: Walks in 1K+ Cities" from iTunes App Store or Google Play to your mobile phone or tablet. With the help of the easy-to-use interface of the app you can create self-guided walks to explore Boulogne sur Mer single-handedly. Each such walk comes with a detailed route map and GPS navigation to guide you from one tour stop to next. The app works offline, so no data plan is needed when traveling abroad.