User's Manual

ED 3100 G 140 / 04 (2011-11)
Operating Instructions
C-1 Voyage Planning
C VOYAGE PLANNING & MONITORING.fm
C-31
NACOS Platinum
1.1.7.3 Computation of Sailing Times
The system computes the sailing times that will occur if the track is sailed at a Planned Speed or at a
variable speed, depending on the Departure Time and the Arrival Time (planned time of arrival).
In both cases it also calculates the effect of a speed limitation set by the route parameter MAX SPD
available for each leg of the pre-planned track. This computation is done each time when you enter a
route parameter which is changing the route distances, the relevant speed values or the ETA/ETD values.
- If you set the Planned Speed for the complete voyage, the system calculates a time schedule
based on the speed settings contained in the planned route. It results in the displayed estimated
time of arrival (ETA) for each waypoint in the route and the entire sailing time under ETE.
- If the planned time of arrival (ETA) is input at the beginning of the voyage, the system performs
a speed calculation for the complete route. This calculation is based on the Departure and Arrival
Time set for the planned route, and its purpose is to display the required speed for each leg in
order to achieve the required time of arrival at the end of the route.
- In both cases, the result, the calculated speed for each leg, is displayed under calc. SPD in the
Route List, and can be used by the operator as the current speed setting during manual speed
control. The calculated speed values are in any case limited to the MAX SPD values which may be
defined differently for each single leg of the entire route.
- Additional to the time and speed data in the waypoint and route list, and independent of the calcu-
lation method the estimated time elapsed (ETE), i.e. the entire sailing time will be displayed to the
right of the Planned Speed controls.
- In a system equipped with SPEEDPILOT, the calculated speed values of the route can also be
controlled automatically while the ship is sailing along the pre-planned track. In this case each calcu-
lated speed value of a leg will be used as the set-point for the speed controller and the planned
time schedule is thus fulfilled, if nothing unforeseen happens in between.
Initial Time Schedule
If you load or reload a route, or a new one has been created, the program will set all calc. SPD values
to maximum speed (i.e. to the MAX SPD values contained in the route). At the same time a time schedule
will be calculated based on these speed values and the first and last waypoint will contain the implicitly
resulting departure and arrival time.
Time Schedule with ETA
In order to adapt the initial time schedule of the route to your demands perform the following steps:
1. Select the departure point from the waypoint list and in its ET Mode field set the mode to Depar-
ture.
2. Enter time and date of departure in the ETA/ETD field; this will result in an adapted time schedule,
using the speeds shown in the calc. SPD column.
3. Select the arrival point from the waypoint list and in its ET Mode field set the mode to Arrival.
4. Enter time and date of arrival in the ETA/ETD field.
T
his will result in an adapted time schedule by changing the speeds shown in the calc. SPD column but
keeping the departure time.
As long as the MAX SPD values of the planned route are not achieved, the adapted time schedule will
follow your settings for the ETD and ETA (refer also to the Notes below).