If the current position of a vessel is not correct (or if the current position was accidentally deleted), then double-clicking the previous correct position in the position history grid will bring back the old position of the vessel and put the selected row into edit mode in case further changes need to be made.
Select the vessel.
Go to the position history grid (bottom right side of the page).
Select the row of the previous position that you wish to retrieve and double-click.
The vessel’s row will display the previous position data and will turn into edit mode.