Furuno 841, 821 manual Echo Stretch magnifying long range echoes

1.5NM		HDG	326.8°	AUTO
0.5
DEPTH			XTE	SPD
350.0m			0.05NML 30.0KT
WAYPOINT			POSI L/L
12.0NM	45.0°M		66° 04. 00N
			166° 04. 00E
VRM		EBL	+ CURSOR
0.675NM 240.1°R			0.646 NM	308.7°R

Figure 2-18 Sample nav data display

Setting up the nav data display

1)Press the [MENU] key.

2)Select Nav Data and press the [ENT] key.

		● NAV DATA MENU ●
Select item and option
by ▲▼ keys.				GPS LC
1.	Navigator		ALL
2.	Nav Data Disp		OFF	ON
3. Pos Disp Mode			L/L	TD
4.	Depth Unit		M FA		FT
5.	Temp Unit		°C °F
6. STBY Display			NORM		NAV

. . . . . . . . . . . . . . . . .

Press HM-OFF to temporarily hide menu.

<Press MENU for main menu.>

Figure 2-19 Nav data menu

3)Select Navigator; GPS, Loran C or ALL (Select all if several navigators are con- nected to the radar. In this case, position data is selected in order of GPS, Loran C and other.)

4)Select Nav Data Disp to OFF or ON.

5)Select Pos Disp Mode to L/L (latitude and longitude or TD (Loran C).

6)Select unit of depth measurement to meters, fathoms, or feet.

7)Select unit of measurement for water tem- perature to Centigrade or Fahrenheit.

8)Select whether to display nav data or "ST- BY". "NORM" for stand-by; NAv for navigation data.

9)Press the [ENT] key followed by the [MENU] key.

2.23Echo Stretch (magnifying long range echoes)

Normally, the reflected echoes from long range targets appear on the display as weaker and smaller blips even though they are com- pensated by the radar’s internal circuitry. To stretch long range echoes, in the range di- rection, turn on the echo stretch function.

Distant echo

Echo stretch OFF Echo stretch ON

Figure 2-20 Echo stretch

Turning echo stretch on or off

1)Press the [MENU] key.

2)Select P/L & Int/Noise Rej & ES and press the [ENT] key.

3)Select Echo Stretch.

4)ON or OFF.

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