We have purchased the IMU module for an ROV project but we plan on putting it inside the rover. So I just wanted to know if we could use the IMU module directly without coating the board with epoxy. Will that change the readings of the IMU?
If the IMU is not external, you will not have depth function. The IMU has a depth sensor that must be exposed to the water to read the pressure and convert it to depth. Following the instructions to epoxy the board is very easy and will then provide full function. (depth hold etc.)