Eagle Electronics SeaCharter 502cDF - Manual (Page 168)

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To change the units:
Press MENU | MENU |
↓ to
S YSTEM S ETUP
| ENT | ENT .
System Setup submenu (left). Units of Measure Menu (right).
To set Unit of Measure: Highlight the unit of measure you want to
change and press
ENT . After the option is set, press EXIT repeatedly to
return to the main page display.