Holux GM-120 - Manual (Page 21)

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3. To return to navigation mode, repeat steps 1 and 2, and select
GPS On to resume satellite navigation.
To switch between simulation and navigation mode from any page:
1. Press the Menu twice button to display the OSD menu.
2. Use the navigation keys to select System Setting and press OK.
3. Under the Set 1 tab, use the navigation keys to highlight
Navigation Mode option and press OK.
4. Use the navigation keys to select Simulation or Normal (for
navigation mode) as required and press OK to save your settings.