Tutorials
      Back to home
      1. ASD Knowledge Hub
      2. HD408 Auto Steering System
      3. Tutorials

      Choosing a Correction Source - HD408 Auto Steer System

      This guide explains the 3 RTK and GNSS correction sources that can be used for Autosteering.

       

      1. Introduction to Correction Sources 0:01
      • Overview of three correction sources available for the HD408 system:
        • PPP GNSS (Precise Point Positioning, Global Navigation Satellite System )
        • CORS network (Continuously Operating Reference Stations) or other cellular RTK networks
        • DigiFarm - Subscription based cellular CORS network offered by Agri Spray Drones
        • Radio RTK base station


      2. Accessing the Menu  0:09

      • Click on the gray Radio tab at the top of the screen to access correction source options.

       


      3. Using PPP GNSS (Option 1)  0:31

      A convenient option that uses precise satellite signals and clock corrections derived from a global network of reference stations. No subscription or additional equipment required.

       

      • To use PPP GNSS:
        • Click 'Auto Search' and then 'Search' to load PPP options.
        • Choose SBAS (U.S. Satellites) or E6 HAS (European Satellites)
        • Do not select B2b, as it is not compatible in the U.S.
        • Press 'Reset GNSS' to restart the connection
        • On the main screen, the satellite count will return to ‘0’ and then start climbing
        • Reaching 'FIXED' RTK will take 10-15 minutes


      4. Using CORS Network, Digifarm, or RTK Base Station (Options 2 & 3)  1:15

      Best for a reliable, precise connection. Requires an existing base station or CORS/cellular RTK network account.

      • For CORS network or RTK base station:
        • Click 'Manual Select' tab at the top of the screen
        • For CORS network, select 'Cors Station' and input settings and license information.
        • For Radio station, select 'Radio Station' and input base station settings.
      • Press 'Reset GNSS' to restart the connection
      • On the main screen, the satellite count will return to ‘0’ and then start climbing


      5. Final Reset and Connection 1:47
      • As stated above, after selecting any correction source or switching between sources, press 'Reset GNSS' to reconnect to reset the connection.
        • The system will start at 0 satellites and should reach 28 to 30 for optimal performance.

       

      **Important Notes** 2:02

      • Confirm RTK is ‘FIXED’  before starting calibration or operations for successful auto steering.
      • Connect to a correction source in a large open area away from trees or buildings for best results
      • 'FIXED' PPP GNSS connection may take up 15 minutes 

       

      Click Here for an Auto Steering System (Full Kit)

      Stay Informed: Subscribe to the Agri Spray Drones Newsletter

      How to Subscribe

      Subscribing is easy and takes less than a minute:

      1. Visit Our Website
        Go to www.agrispraydrones.com 

      2. Scroll to the Bottom of the Homepage
        Look for the “Subscribe to Our Newsletter” section.

      3. Enter Your Email Address
        Type in the email address where you'd like to receive updates.

      4. Click “Subscribe”
        Once you submit, you’ll be added to our mailing list and will start receiving valuable updates straight to your inbox.

      Don’t Miss Out

      Join thousands of ag professionals who trust Agri Spray Drones for the latest in drone spraying and precision ag.
      Subscribe today — and let us help you take your operation to the next level.