Furuno FR-8111, FR-8251 Starting echo trail, Canceling echo trail, Trail time, Trail reference

True trails Relative trails

Figure 1-21 True and relative echo trails.

Note: If the true trail is selected on the stabilized RM (CU, NU), targets whose extensions hit own ship are not always on a collision course.

Starting echo trail

Press the ECHO TRAIL key to start the echo trail function. "REL (or TRU) TRAIL", the echo trail time selected (on the TRAIL menu) and elapsed time appear at the top right-hand corner of the display. Then, afterglow starts extending from all targets.

Canceling echo trail

Press the ECHO TRAIL key to erase echo trails and echo trail indications.

Trail time

Trail time can be selected on the TRAIL menu.

1)Press the MENU key.

2)Select the TRAIL menu.

3)Press the ENTER/SELECT key.

4)Select TIME and press the ENTER/SELECT key.

5)Select trail time among 15 seconds, 30 sec- onds, 1, 3, 6, 15, 30 min, or continuous (99 minutes 59 seconds).

6)Press the ENTER/SELECT key.

7)Press the MENU key.

Trail reference

Echo trails can be displayed relative to own ship (relative) or with reference to north (true).

1)Press the MENU key.

2)Select the TRAIL menu.

3)Press the ENTER/SELECT key.

4)Select MODE and press the ENTER/SELECT key.

5)Select trail reference; true or relative.

6)Press the ENTER/SELECT key.

7)Press the MENU key.

Trail gradation

Echo trails may be shown in monotone or gradual shading (multiple). Gradual shading paints the trails getting thinner with time just like the after- glow on an analog PPI radar.

Monotone trail Multitone trail

Figure 1-22 Comparison of

trail gradation types

1)Press the MENU key.

2)Select the TRAIL menu.

3)Press the ENTER/SELECT key.

4)Select TONE and press the ENTER/SELECT key.

5)Select SGL or MULT.

6)Press the ENTER/SELECT key.

7)Press the MENU key.

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