Garmin 188c User Manual

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The GPSMAP 188/188C Sounder uses optional Garmin marine 

BlueChart and MapSource data cards to display digital charts and 

maps on-screen. Data cards are installed in the card slot located at 

the bottom right of the unit. Data cards can be installed or removed 

at any time, whether the unit is on or off.

1.  Open the card door by pressing together on the two handles 

at the bottom of the door and lifting it up and open.

2.  Insert the card, with the label facing front and the handle 

bottom, into the slot.

3.  Firmly push the card into the unit. It in not necessary to 

force the card and about 1/2

"

 is still exposed when it is 

properly inserted. If the unit is on, a confirmation tone 

sounds and a message displays on-screen noting the card 

details when the card is properly installed and accepted.

4.  Close the cover.

If you insert a data card and get a “card format not recognized” 

message, try removing the card and reinserting it. If the card is still 

not recognized, contact Garmin Product Support or your Garmin 

dealer for assistance. Data cards are not waterproof and should 

not be exposed to moisture or excessive static charges. Data cards 

should be stored in the case supplied with the card.

1.  Open the card door by pressing together on the two handles 

at the bottom of the door and lifting it up and open.

2.  Grasp the card handle at the bottom and pull down firmly.
3.  If the unit is on, a confirmation tone sounds when the data 

card is removed. 

The first time you insert a data card, the unit takes a few seconds to 

read the card.
After the data card is read, a summary screen appears. Press 

ENTER to acknowledge.