The app is a package tracker. Users enter their tracking number into the app along with a name/label and the app stores it. Users can tap on a tracking number to see detail of the packages history alongside a map.
The whole thing has been wireframed out here: https://gomockingbird.com/mockingbird/#kbkfu1z
I will walk you through the wireframe below, but feel free to get creative with the layout of elements. This wireframe is just a guideline of the functionality that is present in the app.
i have laid out two possible package listing concepts on the "home screen". The images would be icons/logos representing the company (UPS, Fedex etc).
On the bottom right of the home screen will be a refresh button (to update all entries at will) and an "add" button which will bring you to the add package screen where the user will enter a title/label and a tracking number.
Clicking on a package on the home screen will bring you to the package detail page. On the left will be entries relating to the package's journey. The right is a google maps image which will display the various points and path the package has traveled. Tapping an entry on the left will force the map to zoom to the location. Map will need 2 buttons for zooming in/out overlayed on it. The back button on the top left will bring you back to the home screen.
Clicking the settings button on the top right of the package detail page will trigger the edit package screen which will allow you to change the label, the tracking # or delete the entry completely.