Any way to reduce the Google Map API request calls

Any better way to reduce the no of ‘Google Map API’ request call in a web application which send request in every 30 seconds for 50 users to know their latest location details ?

window.setInterval(function () {
changeMarkerPosition();
}, 30000);

function changeMarkerPosition() {

var coolLatlng = new google.maps.LatLng(currentLatitude, currentLongitude);
map.panTo(new google.maps.LatLng(currentLatitude, currentLongitude));
marker.setPosition(coolLatlng);
markers.push(marker);
flightPlanCoordinates[0] = new google.maps.LatLng({
lat : currentLatitude,
lng : currentLongitude
});

}

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