A radar level gauge system for mounting on a hatch of a tank comprising: - a housing adapted to be attached to a hatch of a tank, wherein the housing is adapted to follow the rotational movement of said hatch when attached thereto, - a support arranged inside the housing; - a transmitter arranged inside the housing, which transmitter is attached to the support and adapted to transmit measuring signals at least along a first axis for measuring the distance to a surface in a tank, - a receiver arranged inside the housing and adapted to receive echo signals corresponding to the distance to the surface in the tank when the first axis is parallel to a normal to the surface, - a first processing circuitry arranged inside the housing, adapted to receive the echo signals and to determine a fill level of the tank based on the echo signal, - an inclination sensor arranged inside the housing, and attached to the support, whereby said sensor follows a rotational movement of said hatch whereby said sensor follows a rotational movement of said hatch, and adapted to generate an inclination output corresponding to the inclination of the sensor relative the normal to the surface, - a second processing circuitry arranged inside the housing and adapted to receive the inclination output and to generate, based on the inclination output, an angular output when there is an angular difference between the first axis and the normal to the surface, further comprising at least one of: - a presenter adapted to receive the angular output from said second processing circuitry and to generate a communication output communicating information, about the angular difference, externally of said system, and wherein said communication output comprises status information, which status information comprises a part indicating the value of a given property of the RLG system, said given property being at least one of: that the hatch is open, the angular velocity by which the hatch has been moved, or the amount of time the hatch has been opened and - a communication path arranged inside said housing, electrically connecting the first processing circuitry and the second processing circuitry, and being adapted to receive the angular output from the second processing circuitry and to communicate the angular output to said first processing circuitry, and said first processing circuitry is adapted to initiate an action based on said angular output, said action being at least one of: automatically adjust the hatch into the proper position, and resetting the measurement of the distance to a surface in a tank after the hatch has been open, before measurements of the fill levels are resumed. - a housing adapted to be attached to a hatch of a tank, wherein the housing is adapted to follow the rotational movement of said hatch when attached thereto, - a support arranged inside the housing; - a transmitter arranged inside the housing, which transmitter is attached to the support and adapted to transmit measuring signals at least along a first axis for measuring the distance to a surface in a tank, - a receiver arranged inside the housing and adapted to receive echo signals corresponding to the distance to the surface in the tank when the first axis is parallel to a normal to the surface, - a first processing circuitry arranged inside the housing, adapted to receive the echo signals and to determine a fill level of the tank based on the echo signal, - an inclination sensor arranged inside the housing, and attached to the support, whereby said sensor follows a rotational movement of said hatch whereby said sensor follows a rotational movement of said hatch, and adapted to generate an inclination output corresponding to the inclination of the sensor relative the normal to the surface, - a second processing circuitry arranged inside the housing and adapted to receive the inclination output and to generate, based on the inclination output, an angular output when there is an angular difference between the first axis and the normal to the surface, - a presenter adapted to receive the angular output from said second processing circuitry and to generate a communication output communicating information, about the angular difference, externally of said system, and wherein said communication output comprises status information, which status information comprises a part indicating the value of a given property of the RLG system, said given property being at least one of: that the hatch is open, the angular velocity by which the hatch has been moved, or the amount of time the hatch has been opened and - a communication path arranged inside said housing, electrically connecting the first processing circuitry and the second processing circuitry, and being adapted to receive the angular output from the second processing circuitry and to communicate the angular output to said first processing circuitry, and said first processing circuitry is adapted to initiate an action based on said angular output, said action being at least one of: automatically adjust the hatch into the proper position, and resetting the measurement of the distance to a surface in a tank after the hatch has been open, before measurements of the fill levels are resumed.