Drift effects on expanding square search patterns
As the search patterns account for tidal drift
the resulting Route may not resemble the pattern shown above.

Figure 1. Example expanding square search patterns
Set (Direction): 0°, Drift (Speed): 0 Kts.
Set (Direction): 90°, Drift (Speed): 0 Kts.
Set (Direction): 0°, Drift (Speed): 0.5 Kts.
Set (Direction): 0°, Drift (Speed): 1.0 Kts.