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[Ramon]

You have here an example regarding to how navigate between two points.

HOW TO: Use the Navigate control

Simple Navigate by SteveJG [NavigateRose2] This tutorial is an example of one way to use the Navigate tool to build a Simple Navigate app. The instructions are intended for intermediate or advanced users of App Inventor 2. There are no detailed instructions. Provide similar code in your app. The Blocks are the documentation. Navigate Control The Navigate control provides ‘turn by turn’ directions used to get between two locations. The routing output is similar to directions provided by the G…

In your case, if I don't misunderstanding, your start point would be your current position and your end point would be a stored before location.

To extract the lat/long from the stored point you can use split block.