A liquid filled compass isn’t necessarily better, but it does have its benefits. Most baseplate compasses are liquid filled, which means the needle is rotating through a liquid. This slows the needle, making it less sensitive to movement in your hand. But aggressive movements, such as bumping around in your bag or drops, can develop bubbles in the liquid or create leaks which will impede the accuracy of the compass. Some liquid filled compasses are also sensitive to temperature extremes.