Hi I am using a bar30 sensor to measure water depth but the value is decreasing rather than increasing under water. I am using the sensor.depth and sensor.altitude functions but the readings are very vague. At a height of above 4 storeys from ground level, the altitude reading is 650m. Under water, if i pick up my robot, to get it out of water, the reading goes from -0.7 to -1.2.