فَلَمَّا تَرَٰٓءَا ٱلْجَمْعَانِ قَالَ أَصْحَـٰبُ مُوسَىٰٓ إِنَّا لَمُدْرَكُونَ ٦١
And when the two companies saw one another, the companions of Moses said, "Indeed, we are to be overtaken!"
Your location stays on this device and is only sent, rounded to about 1 km, to fetch the times.