function sledujPolohu(callback) {

    if (!navigator.geolocation) {
        console.log("Geolocation nie je podporovaná.");
        return;
    }

    navigator.geolocation.watchPosition(
        position => {

            const lat = position.coords.latitude;
            const lon = position.coords.longitude;
            const accuracy = position.coords.accuracy;

            callback({
                lat: lat,
                lon: lon,
                accuracy: accuracy
            });
        },

        error => {
            console.error(
                "GPS chyba:",
                error.message
            );
        },

        {
            enableHighAccuracy: true,
            maximumAge: 2000,
            timeout: 10000
        }
    );
}

sledujPolohu(poloha => {

    console.log("LAT:", poloha.lat);
    console.log("LON:", poloha.lon);
    console.log("Presnosť:", poloha.accuracy, "m");

});

sledujPolohu(poloha => {

    aktualnaPoloha = poloha;

    vykresliMapu();

});