ROLLROLL: - : - FFlat / Smooth deep bottomlat / Smooth deep bottom - - OOpposite / Reciprocal linespposite / Reciprocal lines - - SSame / Equal speedsame / Equal speeds

PITCHPITCH: : - Flat bottom to an object or - Flat bottom to an object or - Sloped bank feature- Sloped bank feature

- - OOpposite / Reciprocal linespposite / Reciprocal lines - - SSame / Equal speedsame / Equal speeds

YAWYAW: - Flat bottom to an object or : - Flat bottom to an object or - Sloped bank feature- Sloped bank feature

- Parallel offset lines that are - Parallel offset lines that are run in the Same direction run in the Same direction - Same / Equal speeds- Same / Equal speeds

LATENCYLATENCY: - Flat bottom to an object or : - Flat bottom to an object or - Sloped bank feature- Sloped bank feature

- Same direction lines- Same direction lines - Unequal speeds- Unequal speeds

How is a Patch Test performedHow is a Patch Test performed

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Patch Test LinesPatch Test LinesSingle HeadSingle Head

• Latency: Line C DLatency: Line C D– Same line and directionSame line and direction– Differing speed, sloping bottomDiffering speed, sloping bottom(Watch for settlement differences.)(Watch for settlement differences.)

• Pitch: Line C DPitch: Line C D– Reciprocal lines, sloping bottom. Reciprocal lines, sloping bottom.

Same Survey speed.Same Survey speed.

• Roll: Line A BRoll: Line A B- Reciprocal lines, flat bottom. Reciprocal lines, flat bottom. - Same Survey speed.Same Survey speed.

• Yaw: Lines C D, E FYaw: Lines C D, E F– Offset lines, sloping bottom. Offset lines, sloping bottom. – Same Survey speed.Same Survey speed.

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Dual Head Patch TestDual Head Patch Test

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• Different geometry of the Heads requires that you overlap the

Port and Starboard heads separately.

• Latency and Yaw still only require 2 lines.

• Roll and Pitch tests require 33 lines instead of 22.

• Yaw requires a slightly different spacing and Overlap scheme

• Some Dual Head systems in engineered mounting frames can be

treated as single head.

Dual Head Patch TestDual Head Patch Test

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Dual Head Dual Head Patch TestPatch Test

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Also keep in mind Also keep in mind that your Boat Operator that your Boat Operator will make or will make or BREAKBREAK your Patch Test. your Patch Test.

The more precise The more precise that the Boat Operator that the Boat Operator can run the Patch Test can run the Patch Test lines, the better the lines, the better the results will be. results will be.

Therefore, the Boat Therefore, the Boat Operator should run the Operator should run the Latency, Pitch, and Latency, Pitch, and Roll lines as close to Roll lines as close to Nadir beam over Nadir Nadir beam over Nadir beam, from one passbeam, from one passto the next.to the next.

““Manually” cut Cross Sections Manually” cut Cross Sections Roll TestRoll Test Latency TestLatency Test

Pitch TestPitch Test Yaw TestYaw Test

Dat

a C

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Dat

a C

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Cut Perpendicular to RunlineCut Perpendicular to Runline

Cut On Top of TracklineCut On Top of Trackline

Cut On Top of TracklineCut On Top of Trackline

Cut Parallel to and Between the Cut Parallel to and Between the TracklinesTracklines

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How the Patch Test WorksHow the Patch Test Works

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Good FitGood Fit

•Cross sections Cross sections overlay welloverlay well..

•Error is at the Error is at the minimum pointminimum point..

Poor FitPoor Fit

•Cross sections overlay poorly.

•Large error.

Numerical MethodNumerical Method

•The cross sections are calculated at variousThe cross sections are calculated at various angle offsetsangle offsets. For . For example; example; PitchPitch offset from -10 to 10 degrees in one degree steps. offset from -10 to 10 degrees in one degree steps.

•An An error value error value is calculated at each offset. Error = average depth is calculated at each offset. Error = average depth difference between cross sections.difference between cross sections.

•Minimum error Minimum error is usually the is usually the correct offsetcorrect offset. But not always.. But not always.

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The Patch Test WindowThe Patch Test Window

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Select TestSelect Test

•Pick the tab Pick the tab corresponding to the test corresponding to the test you want to runyou want to run.

Select Sonar HeadSelect Sonar Head

•For dual head For dual head systems, select head systems, select head 1 or 21 or 2

ResultsResults

•Read test results hereRead test results here.

Cross SectionsCross Sections

•RedRed is the first is the first line, line, GreenGreen is the is the second.second.

Error GraphError Graph

•X axis X axis is angle or is angle or time adjustment.time adjustment.

•Y axis Y axis is the error; is the error; difference between difference between cross sections.cross sections.

Vertical AdjustmentVertical Adjustment

•Moves the first line up or down if needed.Moves the first line up or down if needed.

OverrideOverride

•Select Previous or Next adjustment.Select Previous or Next adjustment.

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The New Patch Test WindowThe New Patch Test Window

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Order of ProcessingOrder of Processing::

•Find the Find the LatencyLatency offset firstoffset first

•Apply Latency, then do the Apply Latency, then do the RollRoll test.test.

•Apply Latency and Pitch, then do the Apply Latency and Pitch, then do the PitchPitch test.test.

•Apply Latency, Pitch, and Roll, then finish with the Apply Latency, Pitch, and Roll, then finish with the YawYaw test test.

Patch Test ProceduresPatch Test Procedures

The order that you collect your Patch Test data does NOT make any difference, but the order in which you process it, DOES…

Also keep in mind that your Boat Operator will make or break your Also keep in mind that your Boat Operator will make or break your Patch Test. The more precise that the Boat Operator runs the Patch Test. The more precise that the Boat Operator runs the Patch Test lines, the better the results will be. Patch Test lines, the better the results will be.

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