# To start an RTK radio survey at the rover

1. Set up and connect the GNSS receiver.
2. In Trimble Access, make sure the required job is open.

3. 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.

4. 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.
5. If the receiver you are using supports transmission delays and the Prompt for station index check box in the Rover options option in the survey style is selected, the Select base station screen appears. It shows all the base stations operating on the frequency you are using. The list shows the station index numbers of each base and the reliability of each. Select the base you want to use and tap Enter.

   For more information about using transmission delays, see Operating several base stations on one radio frequency.

   To check the point name of the base station being used in the rover survey, select Files / Review current job and inspect the Base point record.

6. 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.

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

8. Measure or stake out points.

To start a survey using VRS or FKP (RTCM), you must send an approximate position for the rover receiver to the control station. When you start the survey, this position is automatically sent through your radio communications link in a standard NMEA position message. It is used to compute the RTK corrections your receiver will use.