Uber, a start-up that allows people to use a smartphone to request private car service, is promising to fight a cease-and-desist order from the Division of Standards of the Commonwealth of Massachusetts requiring it to stop operating in Greater Boston.

The service’s drivers use GPS location technology, accessed via smartphone, to calculate the charges for each ride.

The letter from the division, dated August 1, states that because there are no guidelines for the use of GPS location technology in commercial transportation from the National Institute of Standards and Technology, Uber’s app cannot be used.

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In a blog post dated Tuesday, Uber, which is available in 18 locations around the world, said that, “it is our strong belief that the technology and service we offer does not violate existing law and regulations. Uber is a first to market, cutting edge transportation technology and the simple fact is that the Commonwealth’s regulations were not written with these innovations in mind.”

The company said, “we are committed to dialogue with the Division on this new generation of technology and to working closely with the agency to keep our service available for our truly Uber users and their drivers.”

In the meantime, Uber said it “will continue full speed ahead with the mission of making Boston and the surrounding areas a great place to live and travel and the Commonwealth the Hub of cutting edge technology.”