Various HUD elements can be seen in this screenshot:
The vertical bar to the left shows the location of other racers and checkpoints in relation to the player.
The orange squares to the bottom left shows the heat level of the speeder.
The purple bars to the right shows the amount of fuel available for the boost.
The concentric circles in the centre show the outside curve of oncoming corners. The player should aim to keep the shaded area of the circles in the 6 o'clock position.
Speed, track number, and position can be seen surrounding the concentric circles.
Lap time is displayed to the top of the screen, though having just passed a checkpoint, it is also displayed near the centre of the screen.
In addition to this, some track features are displayed:
The yellow strips on the track indicate booster loading zones.
The blue strips on the track indicate cooling strips.
Screenshot taken by hahnchen, and released under a Creative Commons Attribution-ShareAlike license, with permission from Bo Andersson, CEO of GRIN. Reuse of this screenshot must include attribution to GRIN, alongside a link to their homepage - http://grin.se.