I use my 510 for my track and road bike. It should come with a speed/cadence sensor and HRM first up. I'm not so much a data nerd but I do look back over what I've done when I upload. As Quinn8it said, make sure you turn the gps off for the track. Also calibrate the tyre circumference correctly by rolling it out and set the record interval to 1sec.
I upload to Strava and Garmin Connect and have found that Strava tends to knock back/miss top speeds by a few km/h compared to Garmin. Garmin seems much more true to what I see on the screen in training.