The Lane Assist doesn't have an on/ off option its on by default all the time, the lane images are different though (these are the static views showing the road signs on the screen when approaching certain major road juctions although depending upon your location you might never see these images even with them enabled - Canada for example only has four pictures for the entire country as far as I understand! - UK coverage is much better though - Mike
On my 930, lane guidance can be enabled/disabed in status bar preferences. I haven't used app 9.x on a 340 so I'm not sure if that setting is available on that model/software.
Go to preferences, click on the right arrow once (if it not there then click it one more time), and you will see the lane guidance icon, just click on it and it becomes enabled. When the feature is disabled you will read "enable lane guidance"
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