Tour operators provide the tour route, a detailed route description, and maps. You navigate using these items.
Some operators have GPS files upon request (to be used on your personal GPS device) and a few offer devices with pre-loaded files) for an additional fee. Please check the "Included services" and "Prices" details on the Dates & Prices tab of the individual tour page for this information.
You may wish to supplement the above items with your smart phone's navigation. Be sure to take care of any data needs before your trip to avoid additional fees.