The cross is an orange horizontal and vertical line drawn following the mouse. It’s designed to help show relative price levels, or to see down to the time scale. The date and price are shown in the status area at the bottom too.
The cross can be toggled with the C key, or from the Tools/Cross menu entry. It can also be enabled just temporarily by pressing and holding mouse Button-3. On a 2-button mouse Button-3 is usually the right button.
There’s a cross in the intraday graphs similarly (see Intraday).
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Chart is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.