Invaluable
Only wish there was some sort of central maps library that we could upload to.

This app helps you find your location on any map by using your phone's GPS. Simply take a picture of a map or paste one, add a few markers, and it will pinpoint your position.
2.8
September 12, 2016
This app has been updated by Apple to display the Apple Watch app icon.
You Are Here uses your phone's GPS and other location services. You'll need to import a map image and then tap on known locations on the map to add markers. The app then calculates your position based on these markers and your GPS data.
You can use any map with You Are Here. This includes park or campus information boards, leaflets, sketches, or even maps copied and pasted from the internet.
The accuracy of You Are Here improves with more markers. While it only needs two markers to find your position, using three or more significantly enhances precision. Adding markers at each side of the map is recommended for best results.
No, You Are Here does not contain advertisements. The app is completely ad-free, allowing for an uninterrupted user experience.
You Are Here is compatible with iPhone, iPad, and iPod devices. It leverages your device's GPS and location services.
You Are Here was last updated on September 12, 2016, with version 2.8. As of the provided data, there have been no subsequent updates.
You Are Here has an age rating of 4+. This indicates it is suitable for children and general audiences.
Yes, like many GPS-dependent applications, You Are Here can drain battery life if used constantly. It is recommended to plug your device into a power source or lock the screen when not actively using the app.