How can I update the software/firmware on the GPS 175?

To update the software/firmware on the GPS 175, please make sure that you have registered your product at www.flygarmin.com then visit the Authorized Content on www.Garmin.com.If you have questions on how to register the product click here. If you are still unable to access the documents and software please contact aviation support at 866-739-5687 or aviation.support@garmin.com. 

To find a Garmin Dealer, visit the Dealer Locator: https://www.garmin.com/dealerlocator/

For Additional Software information, visit: https://www8.garmin.com/support/collection.jsp?product=010-01822-50