14. Route Monitoring
14-11
Time table optimization
displayed in route monitoring.
SPD
SPD profile
kn
kn
NM
NM
Trial SPD
Plan: This displays ETA at final WPT. Value also appears in the Parameters page of the Plan Route dialog box.
Off Plan: Indicates time difference between planned ETA and calculated ETA to final WPT.
Suggested SPD: This is used only when the route has been optimized for "Time table". In time table optimization
the ETA to final waypoint is set by the user (= "set ETA"). The system calculates "estimated ETA" using current
average speed up to next waypoint and then planned speed profile from time table optimization up to final waypoint.
Based on the difference between "set ETA" and "estimated ETA," the system suggests a speed which is the best in
the current leg to keep the "set ETA" for the final waypoint. Note that the target of suggested speed is to meet the
"set ETA" at final waypoint and the target is not to meet any planned ETA for any of the intermediate waypoints.
The table below shows how the system calculates ETAs.
Type of selected speed profile /
optimization on Route Monitor
dialog box
Used speed from current point
to the To WPT
Used speed from the To WPT to the
final WPT
Speed profile: Plan MAX SPEED current average speed planned leg speed
Speed profile: Plan TIMETABLE current average speed planned leg speed
Speed profile: Plan ECO: COST current average speed planned leg speed
Speed profile: Plan ECO: PROFIT current average speed planned leg speed
Speed profile: Trial current trial speed current trial speed
Speed profile: Current current average speed current average speed
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