private int lastZoom = -1;
    private void UpdateRadioLocations()
    {
        float step = 360f / SEGMENTS;
        double x, y;

        Vector2 distance = OnlineMapsUtils.DistanceBetweenPoints(OnlineMaps.instance.topLeftPosition, OnlineMaps.instance.bottomRightPosition);
        float convertToKm = 1;

        float scaleX = convertToKm / distance.x * OnlineMaps.instance.tilesetSize.x;
        float scaleY = convertToKm / distance.y * OnlineMaps.instance.tilesetSize.y;
        float scale = (scaleX + scaleY) / 2;

        foreach (RadioPlacement radio in radioList)
        {
            if (radio.marker.position != radio.lastPosition || lastZoom != zoom) //this check fails on marker drag
            {
                lastZoom = zoom;
                float r = radio.radius * 2 / OnlineMapsUtils.tileSize * scale;
                radio.lastPosition = radio.marker.position;
                radio.marker.GetPosition(out x, out y);
                OnlineMapsProjection projection = OnlineMaps.instance.projection;
                projection.CoordinatesToTile(x, y, OnlineMaps.instance.zoom, out x, out y);

                for (int i = 0; i < SEGMENTS; i++)
                {
                    double px = x + Mathf.Cos(step * i * Mathf.Deg2Rad) * r;
                    double py = y + Mathf.Sin(step * i * Mathf.Deg2Rad) * r;

                    projection.TileToCoordinates(px, py, OnlineMaps.instance.zoom, out px, out py);

                    radio.points[i] = new Vector2((float)px, (float)py);
                }
                OnlineMaps.instance.Redraw();
            }
        }
    }