お使いの機種名を選択して、この情報が該当するかどうか確認してください。
Garmin automotive devices that have the option to use a QWERTY keyboard
Your automotive device has the option to use a QWERTY keyboard using the device settings. If the QWERTY keyboard option is not displayed on the device, update the operating software on the device using the Garmin Express program: http://software.garmin.com/en-US/express.html
For steps on how to change they keyboard layout to QWERTY, see Related Content.