# To start an RTK dial-in 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 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.

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

   The message Connecting to modem appears. The software dials the modem at the base receiver and then starts the survey. When the data link is established, the cellular phone icon appears in the status bar.

   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.

   When you send initialization strings to the modem, if you see the error message No response from modem, check that the strings you set in the survey style are valid for your particular modem. Some modems accept only upper case AT commands.

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

8. Measure or stake out points.