HowTo: entering a waypoint with specific coordinates
On the map screen press and hold . This will bring up the Mark Waypoint window. Now scroll to the coordinates and press .
Now use the rocker keypad to select any of the numbers or arrows you see. When on an arrow, pressing will move the cursor. You can see where the cursor is from the black background in the coordinate numbers. When on a number, pressing will overwrite that number in the coordinate where the cursor is now.
When you are done editing the coordinates, you can also edit other properties. you end editing this waypoint by scrolling to OK and pressing