Furuno BACK GP-80 - Manual (Page 44)

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3) Press ▼ to shift the cursor to the Trial
Speed line.
4) Press t or s to select Auto or Man.
Auto uses ship's average speed to calcu-
late time-to-go.
5) If you selected Man, enter speed.
6) Press the [NU/CU ENT] key.
The range, bearing and time-to-go between
two points appear on the display. If data en-
tered is wrong or insufficient the buzzer
sounds and the message "INCOMPLETE
DATA" appears. If the data contains error, "*"
and all nines appear as the calculation results.
7) Press the [MENU ESC] key.