Earlier versions of the firmware displayed the Lat/Lon coordinates for waypoints and POI entries, but you couldn't edit the fields. With the 1.7.0 release, they made these fields editable, but you have to have them in your address book to edit them.
Start off by selecting any place on the map and then pressing the Red 'Info' button.
Select the 'Add to Addressbook' button and you'll be taken to the 'Edit Waypoint' menu.
Click on the 'Latitude' field to get to the 'Edit Waypoint' menu with the Latitude entry field selected. This is where you get to enter the values for the actual coordinates of your waypoint.
The system is pretty user-friendly in that it will only let you enter North & South in the Latitude field and East & West in the Longitude entries. The system will skip right over the characters to the number fields. When you're finished, repeat the procedure for the Longitude entry.
This process works fine for limited numbers of entries - if you have a lot of waypoints to enter this way, you might want to consider using the free
'GDM' program from Lowrance. This free utility will let you manage your waypoints, routes and tracks.
This is a relatively easy way to enter a large number of waypoints into a 'USR' file that you can copy to your iWay and load them directly into the address book.