Poison Maps, a cool map app in the App Store based on the OpenStreetMap database, takes a novel approach to 3D Touch gestures versus most other 3D Touch-enabled apps, which makes it uniquely useful for navigating.
On non-iPhone 6s devices, the app takes advantage of the patent-pending Context Pan gesture letting you pan large distances by using a single touch of a finger instead of the usual two-fingered pinch-zoom gesture.
On devices without 3D Touch, however, context zooming and context panning is implemented using a long touch to control how far the map zooms out, rather then using the force of the press, as shown in a video demonstration further below.