Sorry for the vague construction of my sentence/thoughts in my head. The accelerometer that I am referring to is the one that is being used in phones. The ones that tell up from down. Yeah I was scratching my head when I first found out that that piece of hardware in smartphones is not called (I assumed) gyroscope. The velocity and current position problem is for the GPS satellites and given that it senses it surroundings. If this device is measuring the surrounding environment, detects that it is 1 meter from a wall/hull, reading velocity of 7.71km/s, and still same distance from the things around it with respect to x,y, and z axis, that really is interesting for me. I'm thinking of a problem similar to the experience of sitting in a bus and the bus next to it leaves. You might sense that the bus you are on is moving but what actually is happening is the other bus is the one that is moving. If you close you eyes you can easily tell that your bus is not moving but the addition of visual information fools the human mind. I'm curious if the addition of the information about its surrounding may have effect in some of its computation resulting to a wrong reading.