To open the Triggers panel, click the Triggers button () or select Tools > Triggers in the scope menu. When the Triggers panel is displayed, triangle pointers appear at the top and right side of the axes on each display. These markers indicate the time position () and level () at the event.
The Erne. The River Erne is located in the north-west of Ireland, rising in Beaghy Lough in County Cavan and flowing in a general north-westerly direction. It is approximately 120 kilometres in length and winds its way through a number of loughs including Upper and Lower Lough Erne.he Bann is the longest river in Northern Ireland, stretching a total of 129 kilometres from the Mourne Mountains in County Down to the northern coast of Ireland, entering the Atlantic Ocean at Portstewart.
The source of the river tends to be close to the watershed which occupies the highest ground around the basin. The journey of the river is then downhill to the sea. Example: River Tees: rises on Cross Fell,seen below, that rises to 890m. The sources of the Tees is 130m below the peak. The path the river follows from its source to mouth is known as the river's course. When studying rivers we often divide it into 3 main sections, the upper course; middle course and lower course.