# To start an RTK rover survey

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 have selected any "Prompt for" settings in the RTK survey style, you are prompted to confirm the correction source. Tap Accept.

8. Use the status bar to confirm the software is connected and receiving correction data.

   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.

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

10. Measure or stake out points.