wrote:
--Why should you have charts on board? And can you fly without them?
--What would you do if you come to the end of your clearance limit, and
you are unable to contact ATC? (ATC is still online, just not answering
-you-)

You can fly without charts. But unless you can memorize all the
relevant information, you should carry one with you.

If ATC is not answering you, try a different COM radio, different
frequency or try calling FSS. Try calling on a cell phone. If none of
them work, squawk 7600, hold at your clearance limit until your EFC and
then proceed to your destination.