You can find any point in your model by entering their XY coordinates and, if necessary, change the zoom level to zoom in or out centred on that point.
To find a point from its coordinates
This displays the Go To XY Coordinates dialog.
The dialog gives you some help by showing the maximum and minimum coordinates in the network
The value given is the shortest distance across the GeoPlan window. This is likely to be the top-to-bottom distance, but may vary depending on the window shape and the aspect ratio.