User having mouse with a scroll wheel can use wheel to zoom in/out to an area of interest. Just move mouse cursor to the point that you would like to see better and scroll the wheel forward. Zooming is performed around the point, which is pointed by mouse cursor. Scroll the wheel in opposite direction to get wider field of view. For those who is familiar with windows "focus" concept it is useful to know that the map capture focus automatically when mouse rolls over. Cursor changes from arrowhead to cross and this is an evidence that map get focus. When control get focus user can immediately interact with it (pan or zoom) - no need to click on it one more time. When mouse cursor leave map, the map control transfers focus to the map window.
Alternatively zooming controls on the right side of map can be used.
Zoom In Zooms in on the center of the map.
Zoom Out Zooms out around the center-point of the map.
The slider between the + / - buttons can be used to set the desired magnification.
Zoom In increases Rangecam and Google map simultaneously. One wheel step changes zoom 2 times. Zoom levels shown on the slider are consistent with Google standards. Google may not have hi-zoom maps for all areas. Rangecam warns user about that and automatically switches to Rangecam map only. In North America as rule Satellite and Road maps have largest zoom up to level 19 in rural area and up to level 20 in big cities.