I can answer 2 and 3.
For 2, if you hit 3 it brings up a pintle gun (top hatch) and you can look around easier up top. The only tanks that do not have this are the T34s. So no there is no map, but you can drive in the number 3 position (rudder left/right) but you just have to shift up/down in the driver seat.
For 3, your clipboard map shows darbars, flashing bases, and dots all around. It will show enemy darbar (red) all of the time unless someone is under 500ft or the HQ is down on your side. If a con is within 10 miles above 500ft, and the base's radar that you are at is up, the con will appear as a red dot on the map. You can move around the map by clicking and dragging. Flashing bases mean someone is inside the dar 'ring' (right click map, select "radar"). It will still flash if they are under 500ft (NOE).