18 SmartPilot X-5 Tiller & GP Tiller Operating Guide
The Raymarine Track keeping algorithm ensures safe operation by correcting any
XTE as quickly as possible, but with a maximum convergence angle of 30º with the
Track Leg. It then maintains the vessel tightly on the desired track.
Large cross track error
If a cross track error of greater than 0.3 nm occurs, the SPX-5 Tiller system will sound
a Large Cross Track Error warning and the Pilot Controller will show whether you are
to the port (Pt) or starboard (Stb) of the planned track.
Tidal stream compensation
Under most conditions, the SPX-5 Tiller system will hold the selected track to within
±0.05 nm (300 ft) or better. It takes account of the boat’s speed when computing
course changes to ensure optimum performance.
Waypoint 1
Waypoint 2
Cross track error (XTE)
more than 0.3 nm
D5415-4
Planned route
Actual route
D3261-4
Waypoint 2
Waypoint 1
Boat's speed over ground
Tidal component
Boat's speed through water
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