If it takes a long time to locate a signal or if the readings appear inconsistent:1 - Check that your belt is correctly positioned on your body. Also check that it's the right way round.2 - Check that you have dampened the sensors on your belt.3 - The HR signal can be affected by electromagnetic interference (power lines, railway, computers etc. When using your heart rate monitor, ensure that you stay away from these kinds of interference4 - Check that the battery is still charged. 0