Gps tracker that leaves trace

Hi all i am looking to build a gps tracker for a robotic lawnmower that allows the user to see where it has cut (leaves a trace as it moves).Thank you in advance

Use a LineString with the Map component with your gps app loaded to an old cell phone strapped to the lawnmower or use an Arduino on the lawnmower that can talk to your phone using Bluetooth. arduino gps - Google Search

I am using a gps and Bluetooth module as this is a project. Have you any examples that could help

There are a few....