Furuno FCV-668 Operator's Manual page 15

Enlarging a nav data indication
You can enlarge and display one of the data indications as follows.
5. Press [ ] or [ ] to select the indication you want to enlarge. A blue cursor circumscribes
your selection. For example, select the depth indication.
6. Press the [+] key to enlarge the data.
7. To return to the full data display, press the [-] key.
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