Past Position Display; Set And Drift - Furuno FR-1500 Operator's Manual

2.9 Past Position Display

The ATA displays equally time-spaced dots (maximum 10 dots at intervals of 30 seconds, 1, 2, 3 or
6 minutes) marking the past positions of any targets being tracked.
If a target changes its speed, the spacing will be uneven. If it changes the course, its plotted
course will not be a straight line in TM mode. In True Motion, the past position display is produced
relative to North (True Trails). In Relative Motion, it is relative to North or Heading as selected.
To turn the past position display on/off:
1. Press [MENU], [7], [7] to display the PLOT menu.
2. Press the [7] key to select ON or OFF from the TRACK field as appropriate.
Selecting plotting interval
On the PLOT MENU 1, select desired past position display plotting interval from the 9. INTVAL
field.

2.10 Set and Drift

Set, the direction of ocean current, can be manually entered in the nearest degree. Drift, the speed
of current, can also be entered manually, in 0.1 knot increments. Set and drift corrections are
beneficial for increasing the accuracy of the vector data. The correction is best made on relative
motion with true vector, watching landmasses, buoys, or stationary targets. Thus, the speed and
course of own ship over the ground are reciprocally calculated and compared with the relative
bearing and range to the reference target to produce a Set and Drift. These values are applied to
all targets. If stationary objects have vectors, the set and drift should be corrected until they lose
their vectors.
If own ship is equipped with a device to indicate ocean current movements, the values shown on it
may be used.
1. Press [MENU], [0], [0] to display the OTHERS menu.
2. Press the [4] key twice to select SET & DRIFT.
SET & DRIFT
↓↑
1.
2. SET & DRIFT OFF ON
3. SET 000.0°
4. DRIFT 00.0kt
3. Press the [2] key to select ON from the SET & DRIFT field, and then press the
[ENTER/SELECT] key.
4. Press the [3] key, enter SET value, and then press the [ENTER/SELECT] key.
5. Press the [4] key, enter DRIFT value, and then press the [ENTER/SELECT] key.
6. Press the [MENU] key.
-2.10-