MARCUM LX-i User Manual

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
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 transducer 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.
www.MarCumtech.com
2019-0401
LX-i
Digital Ice-Sonar
User Manual