Station Number Locator App Development

I need a Station Number Locator app designed for both iOS and Android. The app should be user-friendly and simple, with a single page layout.

Key Features:
- Input for Station Number: A fill box for entering the station number.
- Direction Selection: Two buttons for choosing 'Forward' or 'Back'.
- New Station Entry: A button for inputting a new station number.
- GPS Integration: Upon pressing 'Forward' or 'Back', the app should capture the GPS point automatically, and calculate future station numbers based on distance walked from the captured point.
- Station History: Ability to save history of station numbers.
- Map View: A map view displaying the current and new station locations.

Ideal Skills and Experience:
- Proficient in cross-platform mobile app development, specifically for iOS and Android.
- Strong understanding and experience with GPS integration in mobile apps.
- Ability to create simple, user-friendly interfaces.
- Experience with implementing map views in mobile apps.
- Knowledge of data storage techniques for saving history in mobile apps.

Please note, the project requires the app to be built with a focus on simplicity and usability.