Furuno 1715 can not cancel the guard zone

linhkienbodam

Furuno Fan
Hi,
My furuno 1715 can not cancel the guard zone as we did before. It has been using since 2016 and it works well always. I turned it off and on many times but It happened again. I come to setup menu (press MENU while holding the power) and clear memory but can not fix it. Please help
Thank you
Nick
 

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Holding the ALARM button did not clear the guard zone? Does the alarm button appear to be functioning otherwise?
 
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