Patent ID: 8212777

Claim:
A navigation device, comprising: a first sensor configured to detect a first airflow in response to movement of the navigation device in approximately a first direction; a second sensor to detect a second airflow in response to movement of the navigation device in approximately a second direction, wherein the second direction is substantially orthogonal to the first direction; first and second airflow director plates aligned with the first and second sensors, respectively; a first plurality of openings extending through the first airflow director plate to direct the first airflow through the first plurality of openings and across the first sensor; a second plurality of openings extending through the second airflow director plate to direct the second airflow through the second plurality of openings and across the second sensor, wherein the first plurality of openings extending through the first airflow director plate and the second plurality of openings extending through the second airflow plate are arranged to maintain the first and second airflows substantially independent of one another; and a microcontroller coupled to the first and second sensors, the microcontroller to generate a two dimensional navigation signal based on input signals from the first and second sensors.