Second, turn off the FM. Third,you are inside the maps area, do the steps as "More" -"Settings" - "Sounds and Warnings" -"Volume", slide the round icon to full volume. If it's still not loud for you, pls turn on FM which can transfer the sound of the GPS to the car speaker.
Optional GPS holders can be mounted onto vehicle vents. Enjoy added safety and comfort with an unobstructed driving view. Speedcam function: speeding reminders, red light warnings, and safe driving guidance.