Drift Modelling Simulation Experience Suite

Orange Force Marine Ltd. · IAMSARSolutions

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Use your assigned operational credentials to access the training suite. Standard session duration is 8 hours and can be adjusted by an administrator.

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Incident Details

Input field Calculated

All incident changes saved.

Required to save: Case Title and Scenario Name.

Getting started:

Enter a Case Title and Scenario Name in the fields below, then click Save.
Click Wizard for guided step-by-step setup — it walks you through search object, last known position and time, environment (wind & current), leeway, and model generation.
Or expand the Review Information section below and enter data directly using the Quick Entry, Worksheet Entry, SARMap Entry, or TSI Entry tabs — then click Validate / Generate Model when ready.

Incident: n/a

Case Title

Scenario Name

Case Number

Date

Planner

Datum Number

Search Plan (A/B/C)

Search/Drift Objects

No objects selected

Scenario Notes

Review Information

Use one of the entry methods below to review and validate your drift parameters. Each tab provides a different view of the same underlying data — choose whichever approach best matches your workflow.

Instructions: Review and edit all sections in sequence. Use the section tabs above to jump to a specific section, or scroll the full form below. The Short/Long toggle switches between compact and full field labels.

1. Sources

Current Source Wind Source Confidence (0-1)

Current Forecast Provider Wind Forecast Provider

Source Timestamp (UTC) Notes

Source Data Entry

Tidal Current Data

Time of Observation	Time interval	hours (A)	Direction (B, TOWARD)	Speed (C)	Type	Contribution (A x C, nm)

Surface Wind Data

Time of Observation	Time interval	hours (A)	Wind Direction (B, FROM)	Wind speed (C)	Type	Wind contribution (A x C, nm)

OpenDrift Reader Data Sources (system-managed)

OpenDrift readers are loaded from system settings when configured. Reader URLs are sourced from Admin system settings and are not editable here.

Reader availability: checking...

Last loaded: pending

Reader	Kind	Provider	Coverage	Config	Used by OpenDrift	Data Availability	Reachability	Source
Loading OpenDrift reader settings...

2. Marine Datum Summary

A. Starting Position For This Drift Interval

1. Type of Position LKPLast Known EIPEstimated Incident PDPrevious Datum

1.A LKP Drift Direction

Position Time (UTC, HHMMZ) Position Date

3. Latitude of Position Latitude Hemisphere Longitude of Position Longitude Hemisphere

Edit rules: Latitude must use DD-MM.M with N/S. Longitude must use DDD-MM.M with E/W. For western hemisphere incidents, use longitude hemisphere W.

Auto determine location assessment type from position Location Assessment Type (calculated) Distance to Shore (nm, estimated)

If distance to shore is greater than 6nm, assessment is Oceanic; otherwise Coastal. Disable auto to manually override from dropdown. Note: OpenDrift external readers are separate from shoreline distance providers. Configure shoreline distance under drift.service.runtime.location_assessment.providers.

B. Datum Time

Commence Search Time (UTC, HHMMZ) Commence Search Date

Time to Datum (hours) Additional Forecast Beyond Datum (hours) Total Forecast Window (hours) 2.B.4 Drift Beyond Timeline

C. Average Surface Winds (ASW)

C.1 ASW Direction C.2 ASW Speed C.3 ASW Total Hours C.4 Probable Error of the Average Surface Wind (ASWe, kts) C.5 Probable Error of Drift Velocity due to ASW (ASWDVe, kts)

D. Total Water Current (TWC)

2.D.1 Total Water Current (TWC) Set (T°) 2.D.1 Total Water Current (TWC) Speed (kts)

2.D.2 Probable Total Water Current Error (TWCe) (kts)

E. Leeway (LW)

2.E.1 LEFT of Downwind Set (T°) 2.E.1 LEFT of Downwind Speed (kts)

2.E.2 RIGHT of Downwind Set (T°) 2.E.2 RIGHT of Downwind Speed (kts)

2.E.3 Probable Leeway Error (LWe) (kts)

F. Total Drift (TD)

Use a manoeuvring board or calculator to add Total Water Current and Leeway vectors.

2.F.1 Drift Directions LEFT (T°) 2.F.1 Drift Directions RIGHT (T°)

2.F.2 Drift Speed LEFT (kts) 2.F.2 Drift Speed RIGHT (kts)

2.F.3 Drift Distance LEFT (line F.2 x line B.2) (NM) 2.F.3 Drift Distance RIGHT (line F.2 x line B.2) (NM)

2.F.4 Total Probable Drift Velocity Error (DVe) (kts) $DVe = \sqrt{ASWDVe^2 + TWCe^2 + LWe^2}$

G. Datum Positions and Divergence Distance

Using a chart, universal plotting sheet or calculator, determine the datum positions and divergence distance (DD).

Coordinate format for G fields: Latitude DD-MM.M and Longitude DDD-MM.M (decimal minutes).

2.G.1 Latitude (left of downwind, DD-MM.M) Hemisphere (N/S) Longitude (left of downwind, DDD-MM.M) Hemisphere (W/E)

2.G.2 Latitude (right of downwind, DD-MM.M) Hemisphere (N/S) Longitude (right of downwind, DDD-MM.M) Hemisphere (W/E)

2.G.3 Divergence Distance (DD) (NM)

H. Total Probable Error of Position (E) and Separation Ratio (SR)

Attach Total Probable Error of Position (E) worksheet.

2.H.1 Total Probable Error of Position Squared (E²) (NM²) Calculated in Total Error worksheet line D.1.

2.H.2 Total Probable Error of Position (E) (NM) Calculated in Total Error worksheet line D.2.

2.H.3 Separation Ratio (SR = DD/E) $SR = DD / E$

3. Total Water Current

A. Observed Total Water Current (TWC)

Observed TWC Source Observed TWC Dir (deg True) Observed TWC Speed (kts) Observed TWC Error TWCe (kts)

For directional entries, use true direction in degrees (0-359).

B. Computed Total Water Current

1. Tidal Current (TC)

TC Source TC Dir (deg True) TC Speed (kts) TC Error TCe (kts)

Calculated fields: TC Source, TC Dir, and TC Speed are auto-derived from current source mode + Tidal Current Data modal rows.

2. Sea Current (SC)

SC Source SC Dir (deg True) SC Speed (kts) SC Error SCe (kts)

3. Wind Current (WC)

Manual override for B.3 values (auto is default)

ASW Direction (from Datum C.1, deg True) ASW Speed (from Datum C.1, kts) Downwind Direction (ASW direction +/- 180, deg True)

Wind Drift from Figure N-1 (kts) Divergence of Wind Current (deg) Wind Set Direction (Downwind + Divergence, deg True) WC Speed (kts)

Probable Error of Wind Current (WCe, kts)

Show N-1 WC graph Show N-1 reference image

IAMSAR Appendix N-1 reference — N-1 Reference Image

4. Other Water Current (OWC)

OWC Source OWC Dir (deg True) OWC Speed (kts) OWC Error OWCe (kts)

5. Computed Total Water Current (TWC) Set/Drift

Computed TWC Set (deg True) Vector direction from combined TC, SC, WC, and OWC components. Computed TWC Drift (kts) Vector magnitude from combined TC, SC, WC, and OWC components.

6. Computed Probable Total Water Current Error (TWCe)

Computed TWCe (kts) $TWCe = \sqrt{TCe^2 + SCe^2 + WCe^2 + OWCe^2}$

5. Total Error (E)

A. Probable Distress Incident / Initial Position Error (X)

Use line A.6 when this drift interval starts from a distress position; enter A.6 override from previous datum when applicable.

A.1 Navigational Fix Error (NM) Entered value (from table N-1 or N-2). A.2 Dead Reckoning (DR) Error Rate (%) Entered value (from table N-3). A.3 DR Distance Since Last Fix (NM) Entered value. A.4 DR Navigational Error (A.2 x A.3) (NM) $A.4 = A.2 \times A.3$

A.5 Glide Distance (NM) Entered value (if aircraft/parachute descent heading is unknown). A.6 Probable Initial Position Error X (NM) $X = A.1 + A.4 + A.5$ (or previous datum override below)

A.6 Override from previous datum H.2 (NM) If this interval starts from a previous datum, enter previous worksheet H.2 here.

B. Total Probable Drift Error (De)

B.1 and B.2 are calculated inputs; B.3 is computed automatically.

B.1 Total Forecast Window (hours) B.2 Probable Drift Velocity Error (DVe) (kts) B.3 Total Probable Drift Error De (NM)

Leeway Error (LWe) (kts)

C. Probable Search Facility Position Error (Y)

Enter C.1-C.3 manually; C.4 and C.5 are calculated automatically.

C.1 Navigational Fix Error (NM) C.2 Dead Reckoning (DR) Error Rate (%) C.3 DR Distance Since Last Fix (NM) C.4 DR Navigational Error (C.2 x C.3) (NM)

C.5 Probable Search Facility Position Error Y (NM)

D. Total Probable Error of Position (E)

D.1 and D.2 are calculated from X, De, and Y.

D.1 Sum of Squared Errors (NM²) D.2 Total Probable Error of Position (NM)

Leeway Divergence Angle (deg) Entered value or populated from Leeway graph selection.

4. Leeway Graphs

Auto Calcs from Graph

Auto mode ON: LWe and Leeway Divergence are graph-linked, read-only, and highlighted in blue.

Leeway Profiles Per Selected Object

Paradigm: use one tab per selected drift object. Active tab values feed per-object run payload coefficients and drive the interactive graph/reference focus.

Average Surface Wind (ASW) Direction (deg T) Average Surface Wind (ASW) Speed (kts)

Downwind Direction (ASW direction +/- 180 deg) (deg T)

Leeway Speed (from figure N-2 or N-3 below) (kts) From Graph Leeway Divergence Angle (from figure N-2 or N-3 below) (+/- deg) From Graph

Left of downwind (deg T) Right of downwind (deg T)

Left of downwind Direction (deg T) Left of downwind Speed (kts) Right of downwind Direction (deg T) Right of downwind Speed (kts)

Probable Leeway Error (LWe) (from figure N-2 or N-3) (kts) From Graph

Show appendix graph templates and overlays Show reference images below graphs Auto-focus active object on tab switch Line Scope

Transparency is enabled in all scopes, including Selected object only, via Search Object opacity sliders.

Search object sliders: loading...

N-2: Leeway of liferafts, survival craft and PIWs

N-3: Leeway rates for various craft

Red dot: Leeway speed at ASW. Blue dot (N-2): Wind current drift point at ASW.

IAMSAR Appendix N-2 reference — N-2 Reference Image

IAMSAR Appendix N-3 reference — N-3 Reference Image

Active object: n/a

7. Effort Allocation Worksheet (Zta)

Datum Type Datum Line Length L (NM) Optimal Search Factor fs Nearest Assignable S (comma list, NM)

8. SRU / Zta Data

Total Available Search Effort (Zta NM²)

Current Records Wind Records

B Drift Interval

Position Type B.1 Position Time (UTC, HHMMZ) B.1 Position Date B.2 CSP Time (UTC, HHMMZ) B.2 CSP Date B.3 Drift Interval (hours)

B.3 LKP / Starting Position

Latitude (DD-MM.M) N/S Longitude (DDD-MM.M) E/W

C / Q-4 Apparent Surface Wind (ASW)

C.1 ASW Direction FROM (°T) C.2 ASW Speed (kts) C.3 Total Drift Interval (hours) C.4 ASWe — Probable Error of ASW (kts) C.5 ASWDVe — Probable Drift Velocity Error due to ASW (kts)

D / Q-5 Total Water Current (TWC)

1. Tidal Current (TC)

TC Set TOWARD (°T) TC Drift (kts) TCe — Probable Error (kts)

2. Sea Current (SC)

SC Set TOWARD (°T) SC Drift (kts) SCe — Probable Error (kts)

3. Wind Current (WC)

ASW Speed (from C.2, kts) Downwind Direction TOWARD (°T) WC Drift from Figure N-1 (kts) WC Divergence (°) WC Set TOWARD (°T) WC Drift (kts) WCe — Probable Error (kts)

4. Other Water Current (OWC)

OWC Set TOWARD (°T) OWC Drift (kts) OWCe — Probable Error (kts)

5. Computed TWC

Computed TWC Set TOWARD (°T) Computed TWC Drift (kts) Computed TWCe = √(TCe²+SCe²+WCe²+OWCe²) (kts)

E Leeway

Leeway speed and error are read from the Leeway graph. Use Worksheet Entry > Leeway to set the object and read graph values.

Leeway Speed (from graph, kts) Leeway Divergence Angle (°) Leeway Error LWe (from graph, kts)

5A Initial Position Error (X)

A.1 Navigational Fix Error (NM) A.2 DR Error Rate (%) A.3 DR Distance Since Last Fix (NM) A.4 DR Nav Error (A.2 × A.3) (NM) A.5 Glide Distance (NM) A.6 Probable Initial Position Error X (NM)

5C Search Facility Position Error (Y)

C.1 Navigational Fix Error (NM) C.2 DR Error Rate (%) C.3 DR Distance Since Last Fix (NM) C.4 DR Nav Error (C.2 × C.3) (NM) C.5 Probable Search Facility Position Error Y (NM)

5D / H Total Probable Error (E) and Separation Ratio

D.1 Sum of Squared Errors E² (NM²) D.2 Total Probable Error E (NM) H.3 Separation Ratio (SR = DD ÷ E)

Generate Models to Calculate Datum

Select one or more drift models, verify your source data, then submit the run. Results will appear in Computed Results below. Use IAMSAR for manual planning or OpenDrift for probabilistic simulation.

Model Selection and Run Controls

Use this section to select one or more active models and run validation/submit actions. The layout supports additional models as they are enabled.

Model Selection

Selected models (2): IAMSAR, OpenDrift

Available Models

IAMSAR ON OpenDrift ON

Planned / Future Models

CANSARP

Instructions placeholder for future guidance.

Shared Drift Inputs (all selected models)

Start Lat * Start Lon * Hours * Time Step (min) *

Set Dir (deg True) * Set Speed (kn) * Wind Dir (deg True) * Wind Speed (##.#kts) *

Wind Direction Convention

Leeway Coeff * Uncertainty (kn) *

Leeway Figure (active object) Leeway Speed (graph) (kts) Leeway Divergence (graph) (deg) Leeway Error LWe (graph) (kts)

Selected Object Transfer (Leeway to Generate Models)

Object	OBJKEY	Figure	Leeway Speed (kts)	Divergence (deg)	LWe (kts)
Waiting for Leeway object selection...

IAMSAR Model Settings

No additional IAMSAR-only controls are required here. IAMSAR uses the shared drift inputs above.

OpenDrift Model Configuration

OpenDrift Core Settings

OpenDrift Model *

No model selected

Leeway is the default SAR model. Add OpenOil only for oil or fuel drift cases.

Particles * Default 1000. Use 1000-3000 for SAR when you need a fuller uncertainty cloud. Time Step (sec) * Default 600s. Drop to 300s when diagnosing first-timestep stop issues.

OpenDrift Advanced Tuning

Seed Radius (m) Default 500m. Increase it only when the LKP itself is uncertain. Random Seed (optional) Default blank. A fixed seed helps comparisons, not operational accuracy. Particle Type (OpenDrift OBJKEY) Selected object profile key(s) will be shown here in readable form.

Computed Results

View run history, model outputs, and computed datum positions. Compare results across runs, review diagnostics, and export data for search planning.

Speed Loop

Play Object

Auto-pan Pan Mode N

No timeline Object: n/a Distance: n/a

Style key: Center track = solid faded, Left divergence = dotted, Right divergence = dashed.

Show center track

Administration: Users

Affiliation Scope

Company Entity Location Entity Address

User Management

Users Overview

Use this section for user profiles, roles, activation, and organization affiliation.

Overview

No drift service status loaded.

Status has not been loaded yet.

Loading current drift calculation configuration...

Execution Mode

Current Mode Guidance

Select a mode to view backend details.

Docker Worker

Enable Docker worker backend Docker Image Timeout Seconds Docker Network (optional)

Use this only when worker containers must join a specific existing Docker network. Leave it blank to let Docker choose the default network. The list shows common examples, but custom network names are valid too.

AWS Batch

Enable AWS Batch backend AWS Region Job Queue Job Definition Job Name Prefix Poll Interval Seconds Submit Timeout Seconds

Mode-specific guidance will appear here.

JSON Snippet

Backend Health

No backend status loaded.

Operational Guidance

Use Refresh to load current backend health and recent execution activity.

Recent OpenDrift Runs

No drift runs loaded.

System Performance

Drift method execution metrics are summarized from recent runs inside the current admin scope.

No drift performance data available.

Run	Method	Status	Environment	Backend	Runtime	Objects	Particles	Step
No drift performance data available.

How to Edit a Setting

Click a setting name in the list below to select and load it.
Edit the fields that appear in the right panel.
Click Save Setting to persist your changes.

One record per application. Suggested names: web.app and drift.service. The drift.service record controls execution mode, Docker worker, and AWS Batch settings.

System Settings

Click a row below to load it for editing.

New Setting Template

Template Base New App Name

Save / Create / Delete

No setting selected. Click a row above to load one, or use New Setting to create one.

Setting ID (blank=create) Application Name Schema

Loaded Setting Entries

Load a schema to view grouped editable setting entries.

No schema loaded.

Settings JSON (Structured and Native Raw)

JSON Subcategory

(not set)
PIW (Unknown)
PIW (Conscious/PFD)
PIW (Survival suit)
PIW (Scuba suit)
PIW (Vertical)
Life Raft
Life Raft (Deep ballast)
Life Raft (Shallow ballast)
Small Open Boat
Sport Boat (cuddy cabin)
Sport Fisher (center console)
Sailing Vessel
Sailing Vessel (Full keel)
Skiff (Flat-bottom)
Skiff (V-hull)
Fishing Vessel
Commercial Fishing Vessel
Coastal Freighter
Kayak
Surfboard with Person
EPIRB/SLDMB
FV Debris
Other

Sign in to Drift Modelling

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Drift Parameters

Incident Details

Review Information

1. Sources

Source Data Entry

Tidal Current Data

Surface Wind Data

Weather File Uploads

OpenDrift Reader Data Sources (system-managed)

2. Marine Datum Summary

A. Starting Position For This Drift Interval

B. Datum Time

C. Average Surface Winds (ASW)

D. Total Water Current (TWC)

E. Leeway (LW)

F. Total Drift (TD)

G. Datum Positions and Divergence Distance

H. Total Probable Error of Position (E) and Separation Ratio (SR)

3. Total Water Current

A. Observed Total Water Current (TWC)

B. Computed Total Water Current

1. Tidal Current (TC)

2. Sea Current (SC)

3. Wind Current (WC)

4. Other Water Current (OWC)

5. Computed Total Water Current (TWC) Set/Drift

6. Computed Probable Total Water Current Error (TWCe)

5. Total Error (E)

A. Probable Distress Incident / Initial Position Error (X)

B. Total Probable Drift Error (De)

C. Probable Search Facility Position Error (Y)

D. Total Probable Error of Position (E)

4. Leeway Graphs

Leeway Profiles Per Selected Object

7. Effort Allocation Worksheet (Zta)

8. SRU / Zta Data

Generate Models to Calculate Datum

Model Selection and Run Controls

Shared Drift Inputs (all selected models)

Selected Object Transfer (Leeway to Generate Models)

IAMSAR Model Settings

OpenDrift Model Configuration

OpenDrift Core Settings

OpenDrift Advanced Tuning

Computed Results

Run History

Trainer Console

All Run History

Training Incident Management

Template Library

Saved Training Incidents

User Settings

Display Preferences

Navigation Settings

Run History Display

Map

Visible Entry Panels (at least one required)

Profile

Password

Administration: Users

Affiliation Scope

Users

User Management

Users Overview

Reports

Summary

Affiliations

User Affiliation

Notes

Companies

Company

Notes

Entities

Entity

Notes

Addresses

Address

Notes