Lowrance electronic AirMap 1000 - Manual (Page 18)

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grips on the outside edge of the battery compartment cover. Press in on
the grips and lift the cover away from the unit case. The battery cover
will pull free.
Loosen thumbscrew and remove AirMap battery cover.
Install the batteries according to the decal in the battery compartment,
which shows the correct polarity. Point the positive pole of the leftmost
battery down, and alternate them as you move right.
Replace the battery compartment cover. Align the cover latch tabs with
the slots inside the case. Slide the cover into place, and then push down
on the bottom edge until the cover snaps into place.
Replace battery compartment cover:
Slide cover into place, left. Press in cover's bottom edge, right
Cigarette Lighter Power Adapter
To use external DC power: Plug the power cable's cigarette lighter
adapter into a cigarette lighter receptacle. Next, firmly press the cable's
connector into the socket on the back of the AirMap's case.