20 Most Recent Lowrance Lst 3800 In Dash Digital Depth And Temp Guage - Page 5 Questions & Answers

melbourne time zone or simply wind the clock on 12 hours

Press & hold the + & - key while powering unit on, continue to hold the +/- keys until the unit boots up to warning screen. This don't do it, call support 800-628-4487 and talk to a tech as an "experienced technician". Best luck & good fishin!

I notice in your photo a small dot in the top lh corner if there are 3 matching dots in the other corners, I am thinking that they are plastic covers for the screws underneath if that is the case gently pry the covers off as they will clip over a retainer or the head of the screw

Trolling speed TOO slow for units transducer to sense.

This type of button/switch has been known to stick. Place your fingernail on the button corners/edges one at a time,press and slide to 'pop' the button up. If this has an effect on the ops it may only be temporarily. Good luck on the fishing.

The speed of your boats travel only directly affects your sonars ability to read the water depth. your backtrack feature is GPS based. These is not affected by your boat being on plane. Your screen being black sounds like your sonar is losing bottom contact due to air bubbles passing under the transducer. This is a common occurrence with most boats. Add some details regarding what your seeing and we can help you get a better handle on your difficulty.