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Ship stability has various conditions during the addition, reduction or transfer of cargo. Increasingly advanced technology to support ship technology requires an alarm system that is used to determine the tilt of the ship when it exceeds the specified limit and also monitors the tilt of the ship to make it easier and can be prevented when experiencing tilt by adding, reducing or transferring cargo. In this case, a digital inclinometer system is needed which is used to monitor the slope stability of the ship so that it can facilitate the prevention of capsizing and an alarm when the inclination of the ship exceeds a predetermined limit. The digital inclinometer uses the ESP 32 DOIT DEVKIT V1 microcontroller for communication, monitoring, sensor control, and actuators as alarms. An alarm and monitoring system is needed so that fishermen can know the tilt of the ship displayed on the LCD and also as a marker when the tilt of the ship exceeds a predetermined limit. From the results of the test data, it can be concluded from the IMU GY-87 sensor data with a comparison of the box level measuring instrument in the form of the percentage error contained in the IMU GY-87 sensor. The percentage errors include the roll angle when the parameter is 0° with an error percentage of 0.79%, when the parameter is 30° with an error percentage of 0.08%, when the parameter is 45° with an error percentage of 0.01%, and when the parameter is 90° with an error percentage of 0.003%. then at the pitch angle, when the parameter is 0° with an error percentage of 0.05%, when the parameter is 30° with an error percentage of 0.02%, when the parameter is 45° with an error percentage of 0.01%, and when the parameter is 90° with an error percentage of 0.003%. data results from yaw to detect the earth's magnetic field. Thus this magnetometer sensor can be used as a digital compass.
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