Unfortunately, with kids being sick over the weekend, we did not go boating as planned. I did however turn on the unit (840xs), disable sonar transmission and play around with all the settings and pages etc and I can say, that I did not notice any lag or the unit being slow at all.... like I said before, I am only using this unit for chart and sonar functions and it is a stand alone unit - not networked to any other units. Good enough for me!
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