"Richard Russell" wrote in message
...

You don't have to do either. You just have to maintain radio
communications
while within the Class D airspace.


The problem is determining when you are clear of the controlled
airspace.


Why is that a problem?



I've heard more than a few horror stories about pilots
being clear by more than just a few miles (verified by GPS) and the
tower did not concur.


What is the tower basing that call on?