Are you using National Express from Bretonside. Well, here is a bus tracker you can use

Good evening

Ever wondered how you can track your National Express coach around Bretonside

Well, you can click the link below:
http://coachtracker.nationalexpress.com/stops/plygjap/Plymouth_City_Centre_Bretonside_Bus_Station

At the time of writing, a 328 is coming in from Blackpool and a 504 to Penzance.