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LX-i

Digital Ice-Sonar

User Manual

www.MarCumtech.co

m

201

9-0401

until battery door opens. Place the lithium CR-P2 battery into the molded battery compartment. 
Replace battery door by applying gentle downward pressure with your finger while turning the coin 
slot clockwise until you feel a gentle click. You are now ready to use the LX-i to obtain depth 
readings. The battery will last roughly twenty hours of continuous run time or multiple years worth 
of depth readings. Batteries are an expendable item, and must be replaced periodically. The 
batteries that we use are the CR-P2 lithium variety, which are 6 volts.

To Use on Ice

Clear snow from the ice so you have a clean surface. Place a small amount of water on the ice 
and couple the transducer to the water / ice by applying gentle downward pressure while 
pushing the

 'on'

 button. Three dashes will appear in the LCD display. The unit is now in 

Active Bottom Search Mode. When bottom is found, it will be displayed on the digital read out. 
Once the bottom is found, the unit will automatically enter Fish Mode.
In Fish Mode, the unit will actively search for approximately one second. If fish are found, the unit’s 
alarm will activate and the digital display will flash the depth of the target seven times. The unit will 
then revert back to Bottom search mode. The unit will rotate automatically between Bottom Mode 
and Fish Mode until the unit is either turned off or the unit can’t find bottom at which time it will 
shut off automatically within fifteen seconds. To turn the fish alarm off, depress the

 'on/off '

 

button. Ice with air pockets (crusted snow and water that freezes) can make it difficult to 
obtain depth readings. If this situation exists, try other nearby areas until better ice is found. If 
poor ice contin-ues, a hole may have to be drilled to check depths. 

To Use in Boat

To obtain a depth reading through a boat hull, place water in the bottom of the boat. Make sure 
that the transducer face has enough water to eliminate any air between the transducer face and 
the bottom of the boat. Another method is to coat the bottom of the LX-i transducer with petroleum 
jelly and couple to the bottom of the boat. To obtain a reading over the side of a boat, hold 
the transduce

r

 the water 1/2 to 1 inch and push 

'on'

. Be sure to hold the unit exactly vertical 

or the reading won’t be accurate.

Thank you for purchasing the LX-i by MarCum 
Technologies, the most advanced hand held digital 
sonar ever made. The MarCum LX-i can be used to 
shoot  through  the  ice,  single  layer  aluminum 
boat  hulls,  fiberglass  hulls,  or  can

 

be  used  from 

inflatable watercraft.

To Get Started

Remove the battery door located on the lower 
backside of the unit. Insert a coin into the coin slot and 
turn counter clockwise. Place the coin under one of 
the slotted corners and apply gentle upward pressure 

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