Is there any way I can use my own Google Maps route with this software?

Now every one knows that we can edit(by dragging the blue line in the map) our given route in the maps and google will give new directions accordingly. How I can use this feature in our mapper software?

And is there any way I can use this software without GPS unit(like GPS offline mode)? I mean when i download the route and start my driving it should show my first instruction , once i complete that direction i just click next button or some button on the 770, then it will show my next instruction(in screen map also will move that that location) and it should show all instruction with scroll bar when ever i needed in the middle of driving and some arrow pointer should point to where i am ..... like that (just to avoid paper printout )