How to pass navigation status from android to arduino?

Question

css

Good day to all.
I think Everyone knows that in some cars there are regular dashboards for navigation. There are complete ones that duplicate the information of the navigator, and there are gnawed ones that simply indicate how many meters and where to turn.
The essence of the question is how to take this status (well, for example, after 300 meters to the right), and transfer it to the arduino, how to shove it further into the can so that the tidy understands, I know, but how to take the information from the navigator (stationary in the car, on android) until I can understand.

Answer 1

Example

<div class="bg-outer b1">
  <div class="bg-top"></div>
  <div class="bg-inner">Test</div>
</div>

html {
  min-height: 100%;
  background-color: #fff;
}
.bg-outer {
  overflow: hidden;
  position: relative;
  display: inline-block;
  margin: 50px;
  vertical-align: top;
  font-size: 2em;
  color: #fff;
}
.b1 {
  width: 400px;
}
.b2 {
  width: 250px;
}
.b1 .bg-top {
  box-shadow: 0 0 0 1000px #669;
}
.b2 .bg-top {
  box-shadow: 0 0 0 1000px #c33;
}
.bg-inner {
  position: relative;
  padding: 30px 30px 50px;
}
.bg-top {
  position: absolute;
  top: 100%;
  left: 50%;
  width: 500%;
  border-radius: 50%;
  transform: translate(-50%, -1%);
}
.bg-top:before {
  content: "";
  display: block;
  padding: 100% 0 0;
}