In the Arduino IDE, you can turn on line numbers under FILE->Preferences. Its a checkbox that says "Display line numbers"
FI - On the tracksoar, there is a GPS LOCK led that will flash at one second intervals once GPS lock is attained. I've seen it take as long as 10 mins to achieve lock in both versions. Helps to have a clear view of the key (i.e. outdoors).
I believe this LED flashes independently of the micro, but the sketch will not send out a fix until lock has been achieved.