1. If you want to make a new waypoint using the TAD, just hook a point on the TAD, make it SPI, and press TMS right short. Now switch the knob on the right panel to "mark", your new waypoing will be called "A". As long as you have an SPI, you can make it a "mark" point, so to speak.
2. not sure, sorry
3. That is because when you zoom in to far there is no map (im guessing because of the resolution or something). When you zoom out you should see the textured map.