Navigation Window

 

	Track Boat - The display updates periodically to always maintain the current boat position on the screen.
	Track Reference - The display is centered on a user defined reference position. The screen can be zoomed in or out to view the current boat position relative to the reference. The user can use the mouse cursor to reset the reference position to any point within the plotter display range.
	Track Cursor - This mode is used to run a cursor along the boat's track to view  data held in memory. This can be done while still logging in real time and is useful to determine the position of a possible target that has scrolled off the screen without stopping the current survey.
	Auto Scale - This mode automatically scales the plotter window to show all of the boat's track. This mode is useful to ensure that no gaps have been left in the search grid.

The white diamond on the plotter display represents the survey boat's last position with the boat's track shown in red. The yellow cross is the cursor that can be moved to show any data recorded on the current track. To help an accurate survey to be carried out, a search grid can be overlaid on the plotter, the spacing and orientation of the grid are user defined. If a possible target is found, an electronic buoy can be placed at the boat's current position on the plotter display. When searching for small targets like an anchor or wooden shipwreck, it is often very difficult to accurately steer along a grid with such short spacing between grid lines. In this situation it is sometimes better to use a  circle drawn around the boat showing the estimated maximum detection range. Any gaps in the  search pattern can then be seen easily.