GroupDeal comes integrated with Google Maps because the daily deal is all about getting great discounts from businesses in your local area. When the deal is entered the address of the business is given and that is plotted on a map so that buyers can see where the place is before they decide to buy.
GroupDeal works with both static and dynamic Google maps. If you want to save on page loading time then it's best to use the static map which will open in a new window when clicked. A dynamic map allows the user to zoom in and out but increases the amount of time it takes for the page to load.