Furuno GP-3500 - Manual (Page 84)

5. WAYPOINT
5-12
5.5 Setting Ship’s Speed for TTG
Calculation of TTG is based on ship’s speed data. This data can be set manually
or automatically.
1. Press the [MENU] key to show the main menu.
2. Press the [1] key to show the WAYPOINTS LIST.
3. Rotate the [ENTER] knob to select “SPD TO CALC TTG”.
4. Roll the trackball in left-right direction to select “ACTUAL SPD” or “SIM SPD.”
ACTUAL SPD: Calculating with the actual ship’s speed.
SIM SPD: Calculating with the simulated value.
5. Press the numeric keys to enter a ship’s speed value.
TTG for the waypoint selected with the red cursor is calculated by using the
speed value entered.
6. Press the [MENU] key several times to close the menu.