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We present the goals, strategy and first results of the OmegaWhite survey: awide-field high-cadence $g$-band synoptic survey which aims to unveil theGalactic population of short-period variable stars (with periods $<$ 80 min),including ultracompact binary star systems and stellar pulsators. The ultimategoal of OmegaWhite is to cover 400 square degrees along the Galactic Planereaching a depth of $g = $ 21.5 mag (10$\sigma$), using OmegaCam on the VLTSurvey Telescope (VST). The fields are selected to overlap with surveys such asthe Galactic Bulge Survey (GBS) and the VST Photometric H$\alpha$ Survey of theSouthern Galactic Plane (VPHAS+) for multi-band colour information. Each fieldis observed using 38 exposures of 39 s each, with a median cadence of $\sim$2.7min for a total duration of two hours. Within an initial 26 square degrees, wehave extracted the light curves of 1.6 million stars, and have identified 613variable candidates which satisfy our selection criteria. Furthermore, wepresent the light curves and statistical properties of 20 sources which havethe highest-likelihood of being variable stars. One of these candidatesexhibits the colours and light curve properties typically associated withultracompact AM CVn binaries, although its spectrum exhibits weak Balmerabsorption lines and is thus not likely to be such a binary system. We alsopresent follow-up spectroscopy of five other variable candidates, whichidentifies them as likely low-amplitude $\delta$ Sct pulsating stars.

The OmegaWhite Survey for Short-Period Variable Stars I: Overview and First Results