# To start an RTK internet survey at the rover

1. Set up and connect the GNSS receiver.
2. If you are receiving corrections from a single base station, start the base receiver.
3. In Trimble Access, make sure the required job is open.

4. To start the survey, tap and select Measure or Stakeout. If there is more than one survey style configured, select a survey style from the list. Select the software function to use, for example Measure points.

   When you select a survey style for the first time, the software prompts you to customize the style for your specific hardware.

5. If you are connecting to a DA2 receiver and you are not already signed in to Trimble Access, you are prompted to sign in.

   After signing in, if a message warns No valid Catalyst subscription found, check with the License Administrator in your organization to make sure a valid Catalyst Survey subscription is assigned to you in the Trimble License Manager web app. For more information, see Installing Trimble Access.

6. If a message warns that an option in the receiver is not available, then your receiver options subscription may have expired. To check the expiry date, tap and select Instrument / Receiver settings and check the values shown in the Trimble GNSS subscriptions group.

7. If you are using the modem in the controller to connect to the internet and it is:

   - already connected, the controller uses the existing internet connection for the base data.
   - not yet connected, the controller opens an internet connection using the connection specified in the survey style.

8. If the Prompt for GNSS correction source check box is selected in your survey style, you are prompted to select the GNSS correction source to use.

9. If Connect directly to Mountpoint or the NTRIP Mountpoint name was not configured for the GNSS correction source, or the defined mountpoint cannot be accessed, you are prompted to select the mountpoint you want to receive corrections from.

   The message Connecting to GNSS internet source appears. The software connects to the mountpoint and then begins the survey. Once the corrections data link is established, the GNSS internet source icon appears on the status bar.

   If you are using the internal modem of an SP80 receiver and the first connection attempt fails, you may need to wait up to a minute for the modem to power up and initialize before you attempt the connection again.

   If base corrections are being received and there are sufficient satellites, the survey initializes automatically using the on the fly initialization method. If required, initialize on a known point.

10. If you are using a receiver with IMU tilt compensation, align the IMU.

11. Measure or stake out points.