There are actually 3 instances of a Google search engine in each country, Google Desktop, Google Mobile and Google Maps. This creates an opportunity when ranking for keywords so you can work on rankings in all 3 search engines.
In the spreadsheet screenshot attached you can see keywords on the left and in each column a different ranking for that keyword in either Google Desktop, Google Mobile or Google Maps.
For a business that has a physical location it is extremely important to have an optimised Google My Business listing with all the details filled out about opening hours, having the correct categories of services or products and accompanying images.
The optimisation of this listing with specific keywords is where the opportunity to rank comes in and the importance of this listing in Google Maps experts say is of around 15-19% ranking benefit.