Hi Michael,
Great to see you're still playing along with the gluonpilot after all this time!
The line along the "unknown runway" is the command
CLIMB(40m)
As long as the plane has not reached 40 meters altitude, it will continue to fly in the take-off direction.
The circle he keeps flying is the "Standby" circle. The GOTO command will always move it back to the same circle, that's why you flew the same circle for a very long 21 km
Nice endurance plane
In the GluonCS you will notice buttons: "Standby", "Route", "Descent" and "Flare". If you use wireless telemetry (such as
XBee's), you can press those buttons during flight in order to move to this block of waypoints.
If you don't have XBee's you will need to find another trick to do that.
For example:
BLOCK(standby)
CIRCLE(...)
UNTIL(Channel5) > 1600
BLOCK (route)
....
assuming channel 5 is some kind of a switch on your RC-transmitter (check this using gluonconfig). You can test this on the ground using your FTDI cable. He will stay in the standby circle as long as channel5 < 1600. When you switch the switch on your RC-remote, he will move on to the next block (route).