Maintaining consistent sensor output

An autonomous vehicle comprising:

• a body configured for movement along a surface;
• a sensor on the body to output a signal in a plane and to obtain information about an environment based on the signal;
• and
• a control system to use the information to determine a location of the autonomous vehicle in the environment;
• wherein the sensor is configured to keep constant the plane of the signal for different positions of the body;
• wherein the different positions comprises different orientations of the body;
• wherein the autonomous vehicle further comprises a mount for the sensor, the mount comprising liquid floating the sensor, the liquid having a viscosity that enables the liquid to reach a level state each time an orientation of the body changes relative to gravity;
• and
• wherein the control system is at least partly onboard or at least partly remote from the autonomous vehicle and comprises, alone or in combination, one or more microcontrollers, one or more microprocessors, programmable logic, one or more application-specific integrated circuits (ASICs), or solid state circuitry.