lets take an example of an order entered at 100 with target 110 and a target trailing jump as 1, in this scenario at every one point increase in your direction after reaching set target 110, this 110 will be set as a base price for further trailing, which means, if price rised further example lets say till 115 base target will also be moved upwards and will be excecuted at a one point drop from high. So if the price falls to 114 after making a high of 115, it will be executed.