A method of capturing biometric data is provided that includes calculating, by a terminal device, an angle between a surface of the terminal device and an X-axis of the terminal device. When the angle is other than ninety degrees, a prompt is displayed on the terminal device that is designed to cause a terminal device user to adjust the position of the terminal device into an optimal position. After adjusting the position of the terminal device, the terminal device calculates the angle and when the angle is ninety degrees the terminal device captures biometric data from the user.