I have developed a scale to able use onboard a ferry. The ferry moves up and down, and usually 1 kg will show 0,7 – 1,3 kg on my application depending on the size of the waves. My solution is to build in 2 balance units. Balance 1 is not attached to anything but a 1 kg weight. Balance 2 is attached to the platform on the scale where to put the item. By knowing the actual weight on balance 1, I can read the output in my application. If fx balance shows 0,8 kg my conclusion is that the measured item on balance 2 is 20% to low. This works with small waves because I use a linear function. By knowing the actual weight and variation on balance 1, I need a formula including acceleration up or down and the gravitations influence in order to find the actual weight on balance 2. Is anybody able to figure this out?