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two options: km and miles. The default km represents metric units, while
miles represents imperial units. Use the [UP] and [DOWN] keys to select
km or miles. Long press the [MODE] key to save your changes and return
to the settings menu.
Unit settings interface
6.4 Automatic Shut-Off Time
Short press the [MODE] key to enter the Automatic Shut-Off Time
settings. The automatic shut-off time is 10 minutes by default but can be
adjusted to be anywhere from 5 to 60 minutes. Press [UP] or [DOWN] to
change the automatic shut-off time, then long press the [MODE] key to
save your changes and return to the settings menu.