I have used, do use and will continue to use my cheap Casio that was around £12 or so IIRC from Argos. Has stopwatch, all sorts of beeping functions and even tells the time !
As an ex-instructor/examiner, what used to get my goat was students who would turn up for sorties or tests with wristwatch bling only approximating to UTC (or whatever) by a couple of minutes.
