[8/8 update] The Nearby & Sightings system

The update on August 8 made over the 'Nearby' system and introduced 'Sightings' system in Pokemon Go. Niantic put a message on their website as the following.

Unfortunately, those new systems are equipped for small number of players.
@ummjackson reported the details of the systems on his Twitter.

Note:

We apologize the video attached to the following tweet cannot be watched on this page. You need to jump to his tweet. To see the description of the video, please go down.

Here is the description of the video with the screenshots. You can watch the video uploaded by @ummjackson by tapping the tweet above and visiting his Twitter.

The Pokemon tracking function was renewed due to the update on August 8. The nearby system shows wild Pokemon and PokeStops where the Pokemon can be found. The sightings function is below the nearby.

The player taps the icon of Zubat.

After tapping the Zubat on the nearby screen, the PokeStops where the player can find the Pokemon is marked with footprints on the map view.

Now the player taps the icon of Kingler. The map screen shows the another PokeStop marked with footprints. The player can find the Kingler at the PokeStop.