The white symbols shown on the screen, similar to the Radarbot logo, are Radarboters. They represent other users who are using Radarbot at that moment.
This information shows the approximate location and is updated every 5 minutes.
You can choose whether to display these icons on the map from the display settings.
To customize:
Open the side menu (≡).
Go to Settings.
Tap on Display options.
Enable or disable the option “Show users on the map” according to your preference.