function animate() {
// Update point geometry to a new position based on counter denoting
// the index to access the arc.
point.features[0].geometry.coordinates =
route.features[0].geometry.coordinates[counter];
 
// Calculate the bearing to ensure the icon is rotated to match the route arc
// The bearing is calculate between the current point and the next point, except
// at the end of the arc use the previous point and the current point
point.features[0].properties.bearing = turf.bearing(
turf.point(
route.features[0].geometry.coordinates[
counter >= steps ? counter - 1 : counter
]
),
turf.point(
route.features[0].geometry.coordinates[
counter >= steps ? counter : counter + 1
]
)
);
 
// Update the source with this new data.
map.getSource('point').setData(point);
 
// Request the next frame of animation so long the end has not been reached.
if (counter < steps) {
requestAnimationFrame(animate);
}
 
counter = counter + 1;
}