Once the data card has beenread, a summary screenappears. Press ENTER/MARK to acknowledge.The first time you insert adata card, the unit takesa few seconds to read thecard.Installing and Removing Data CardsThe GPSMAP 172/172C uses optional Garmin marine BlueChart and MapSource data cards todisplay digital charts and maps on-screen. Data cards are installed in the card slot located at the bottomright of the unit. Data cards may be installed or removed at any time, whether the unit is on or off.To install a data card:1. Open the card door by pressing together on the two handles at the bottom of the door and lifting itup and open.2. Insert the card into the slot, with the label facing top and the handle towards you.3. Firmly push the card into the unit. It in not necessary to force the card and about 1/2” is stillexposed when it is properly inserted. If the unit is on, a confirmation tone sounds and amessage displays on the screen noting the card details when the card has been properly installedand accepted.4. Close the cover.If you insert a data card and get a ‘card format not recognized’ message, try removing the card andreinserting it. If the card is still not recognized, contact the Garmin or your Garmin dealer for assis-tance. Data cards are not waterproof, should not be exposed to moisture or excessive static charges, andshould be stored in the case supplied with the card.To remove a data card:1. Open the card door by pressing together on the two handles at the bottom of the door and lifting itup and open.2. Grasp the card handle and pull out firmly.3. If the unit is on, a confirmation tone sounds when the data card has been removed.Appendix GInstalling and RemovingData Cards