# GNSS contact settings

A GNSS contact is contains the information needed to contact a real-time correction source to obtain real-time corrections.

The information required in the GNSS contact depends on whether the modem at the rover receiver will obtain the RTK data by connecting to a:

- server using an IP address (referred to as an RTK Internet data link)

  For steps on configuring the GNSS contact, see:

  - To create a GNSS contact for a rover Internet data link
  - To create a GNSS contact for a base Internet data link

- modem at the base receiver using a phone number (referred to as a RTK dial-in data link)

  For steps on configuring the GNSS contact, see:

  - To create a GNSS contact for a rover dial‑in data link
  - To create a GNSS contact for a base dial‑in data link

When you start an RTK survey that uses an Internet or dial-in data link, the Trimble Access software automatically connects to the real-time correction source using the GNSS contact configured in the survey style. If you experience connection issues, you can check the connection to the GNSS contact. See To manually connect to the GNSS contact.