When you talk about the "Printing" do you mean how to input the coordinates?
To input a custom coordinate in the Marine mode on the 640 please follow the steps below.
1. When the device in on the main screen press the “Charts” screen.
2. Tap the “Mark” button on the top of the screen.
3. Click on “Edit Waypoint”.
4. Click on the “Position” tab.
5. Tap the “Enter Coordinate” option on the screen.
From this point you should be able to type in the coordinate you would like to mark in the device. You will first need the unit to be in the correct position format.
