Symptoms: 

• You are not getting the shot registration you expect
• Shots are missed
  
• Or the shot data seems off

This information come directly from Garmin
Always refer to the manufacturer for the most current information about your Device
https://support.garmin.com/en-US/?faq=b16KkS9ljZ1BRQGvWB6bX7&productID=695391&tab=topics

Before calibrating the Approach R10 you should first look into the placement of the Approach R10, as well as your surroundings, can impact the accuracy of the radar. For the best experience possible, there are some tips and best practices to be aware of.

Ideal Conditions for Indoor or Outdoor Use

• Some concretes may impact performance.
• * When using the Approach R10 near concrete, such as in an unfinished basement or garage floor, covering concrete with carpet or cloth may improve accuracy. Concrete surfaces can cause radar signals to reflect back incorrectly.
• Objects may impact performance.
• * When preparing your hitting area, remove objects, such as fans, from your surroundings when necessary. Objects could cause radar signals to reflect back incorrectly.
• Use the tripod stand that came with the Approach R10. Using other mounts, or attempting to attach it to a wall, could result in inaccurate readings or errors due to the tilt.
•  If Approach R10 is tilted slightly it will compensate for this automatically during your session.
• There should be an unobstructed view from the Approach R10 to the tee.
• When using a mat, or if the tee box is raised, the Approach R10 should have a full clear view of the ball. You may place a wood block or book under the Approach R10 when necessary.
• If the tee box is raised, the Approach R10 should also be raised. Place a wood block or book under the Approach R10 when necessary.
• The ideal location of the Approach R10 is 7ft (2.1m) behind the ball and adjust the device so the red alignment line is aligned with the golf ball and the target of the shot. For more details, see the How to Prepare for a Shot section of the Getting Started FAQ.

Important Notes for Use Indoors

• Make sure that you have enough ceiling height to swing your clubs.
• The room should be at least 15 ft. long x 8 ft. wide x 8 ft. high (4.6 m x 2.4 m x 2.4 m).
• When using a net, make sure the tee box is at least 8 ft. (2.4 m) away from the back of the net. However, using a longer distance could improve accuracy.

Important Notes for Use Outdoors

• When using a net, make sure the tee box is at least 8 ft. (2.4 m) away from the back of the net. However, using a longer distance could improve accuracy.

Calibrating the Approach R10

• NOTE: Check to be sure you are using the Latest Garmin Golf App Software:

HERE: https://support.garmin.com/en-US/?faq=1MNU4rGtXT98VysfHA86q6

There some instances that a calibration is needed.

• If your distance and launch angle are consistently inaccurate, calibrate.
• Calibrate when all of the above suggestions have not resolved your consistently inaccurate data.

How to Calibrate:
To perform a calibration, you must be on the latest software version. This is installed automatically through the Garmin Golf app, but if you are missing the calibration in the menu below, you can use Garmin Express to update the Approach R10.
HERE: https://support.garmin.com/en-US/?faq=1MNU4rGtXT98VysfHA86q6

• Open the Garmin Golf app.
• Select Menu Icon (Android) or More (iOS).
• Select Garmin Devices.
• Select Calibrate.

NOTE: Ensure that the Approach R10 is on a level surface using a level. If you do not have a level, you could use a level app on your phone. This tool will not be needed after you complete the calibration.
Example of Approach R10 With Level Tool

• Select Calibrate.
• Select Done.