Definition of "spot on"

Victor was spot on, of course; in fact, I have often been tempted to seek him out when I have been plagued by diseases of the heart. He'd be able to tell me in ten seconds whether someone was worth a tattoo or not.

1995, Nick Hornby, High Fidelity, London: Victor Gollancz, page 22

His counterpart Neil Warnock got his tactics spot on as Chelsea struggled to get into any sort of groove in the first half.

2011 October 23, Becky Ashton, “QPR 1 - 0 Chelsea”, in BBC Sport‎