Can’t hear sound from iCMTGIS III app on iPhone 6

“When I turn GPS on in my app, I don’t hear any beeps. My iPhone 6 works fine. Volume is turned up. The Navigation Beep and Featuring Beep show checked.”

Please check the Ring/Silent switch on the left side of your iPhone 6. It needs to be moved toward the display side. For additional information, please see the article at

https://support.apple.com/en-us/HT203794

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