1.12Entering Own Ship’s Speed
EPA requires an own ship speed input and compass signal. The speed can be entered from a speed log or navaid (automatic) or through the plotting keypad (manual).
4.Press the [ENTER/SELECT] key to con- firm your selection followed by the [MENU] key to close the menu.
Note: Be sure not to select a LOG option or NAV when respective equipment is not con- nected. If the log signal or navaid signal is not provided, the ship’s speed readout at the screen top will be blank.
Automatic speed input
1.Press the [MENU] key and the [0] key twice to show the OTHER menu.
OTHER
Manual speed input
If the radar is not interfaced with a speed log, or the speed log does not feed correct speed
1.HDG SET
2.SPD MODE
3.MAN SPD
4.DRIFT SET
5.DISPLAY
6.MARK/LINE
7.TUNE
8.NAV DATA
9.EBL/VRM
0.↓
MAN LOG NAV LOG
LOG
enter the ship’s speed as follows:
1. | Press the [MENU] key and the [0] key |
| twice to show the OTHER menu. |
2. | Press the [2] key to select MAN from the |
| SPD MODE field, and then press the [EN- |
| TER/SELECT] key. |
3. | Press the [3] key twice to select the MAN |
| SPD field. |
4. | Enter speed with the numeric keys. |
5. | Press the [ENTER/SELECT] key to con- |
Figure 1-9 OTHER menu
2.Press the [2] key to select the menu item
SPD MODE.
3.Press the [2] key again to select the LOG or NAV.
LOG: | Pulse input from speed |
| log, serial data |
NAV: | Speed data from naviga- |
| tion equipment |
firm your selection followed by the |
[MENU] key to close the menu. |
LOG 10.0KT WT
Or NAV
LOG or NAV speed indication
|
|
| 8.5 | F ← Fore/Aft | |
LOG | 8.7KT | WT | |||
0.5 | SB ← Port/STBD | ||||
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|
|
GT
LOG (serial data) speed indication
About Ship’s Speed
c’
a 
c
b
Wind, current
a:Fore/aft speed
b:Port/starboard speed
c:Speed made good (actual speed)
Pulse signal: a only (water tracking speed)
Serial speed: a and b
Water tracking speed = relative speed (including error due to wind, current Ground tracking speed = true speed (no influence from wind, currents)
Navigator speed: c→c’
Speed input (c) from navgator (GPS, etc.) c is converted to fore/aft direction (c’) and displayed on the radar screen.
