How to use mission planner map interface

hello my friends. i am a developer and i want to implement a Map interface like that in mission planner but not in windows. i want to use graphical LCD connected to MCU instead of PC monitor. i searched alot but i didn’t find something helpful. can any body help me on that??
i just want when my user touches a point on the LCD, the latitude and longitude be returned (not displayed) and i can use that coordination in my code.
please help me

Look at this project. GitHub - middelbh/GPSnavigator: Super low cost GPS navigation system based on Arduino UNO, 320x240 TFT and GPS unit
You need something powerful like a teensy.
But you can make your life easier if you use a raspberry pi…

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thank you Eosbandi
this page has a readme file only??
i can use raspi too but i want the map to be offline and i can access the latitude and longitude as input to my code on raspi.
do you know is it possible or not?
i was thinking that i download pictures from google earth and calculate the coordination by image processing but it takes tooo long

Code is in the .ino file.
For raspberry and google maps, google is your friend.

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