Introduction: Enhancing Airport Realism with Custom Parking Spots

Custom aircraft parking spots are the backbone of a realistic AeroSimulations environment. At a complex hub like Sydney Kingsford Smith Airport (YSSY), default generic parking positions often fail to match real-world airline operations, gate assignments, and ramp layouts. By adding custom parking spots, you can assign specific gates to airlines, define correct pushback directions, and ensure AI traffic flows naturally. This process requires careful planning, accurate data, and a methodical approach to scenery editing. This guide provides a comprehensive, step-by-step workflow for adding custom parking spots at YSSY within AeroSimulations, covering everything from data gathering to in-sim testing.

Understanding AeroSimulations Coordinate Systems and File Structures

Before modifying any airport, you must understand how AeroSimulations handles airport geometry. Parking spots are defined by latitude/longitude coordinates (WGS84 datum), heading (true or magnetic), and physical dimensions. These definitions live inside airport scenery files, typically in .bgl format for compiled scenery or in XML source files used by tools like Airport Design Editor (ADE).

The Coordinate System

Coordinates in AeroSimulations use decimal degrees with six or more decimal places for precision. A single degree of latitude is approximately 111 km, so 0.0001° represents about 11 meters. For parking spots, you need sub-meter accuracy to avoid overlapping taxiways or runway protection zones. The heading of a parking spot is the direction the aircraft faces when parked (nose direction), typically measured in degrees true north (0° to 359°). Most real-world gate assignments are magnetic, so you may need to apply a magnetic variation correction – Sydney’s current variation is about 12° East.

File Structure for Scenery Modifications

Custom parking spots are usually placed in a dedicated scenery add-on folder. A typical layout is:

  • Addon Scenery\YSSY Custom Parking\scenery\ – contains compiled .bgl files.
  • Addon Scenery\YSSY Custom Parking\texture\ – optional texture files (not needed for parking spots).

The scenery configuration file (scenery.cfg) must include a reference to the parent folder. While some simulators handle auto-detection, manually adding a layer in Scenery Library ensures priority over default files.

Gathering Reference Data for Sydney Kingsford Smith Airport

Accurate parking spot locations come from official airport charts, real-time gate assignment data, and aerial imagery. The following sources provide the necessary details:

  • Air Services Australia Aeronautical Charts – The official YSSY Airport Chart shows gate numbers, taxiway identifiers, and obstructed areas. Extract gate coordinates manually using tools like Google Earth.
  • Google Earth overflight imagery – High-resolution satellite images allow you to visually identify gate markings, jetbridges, and ground power units. Mark placemarks with exact coordinates and headings.
  • Flight tracking services (FlightRadar24, ADS-B Exchange) – Live historical data reveals which airlines use which gates. This information helps assign correct airline codes to parking spots.
  • Community-developed reference databases – Forums like AVSIM and FlightSim.com Scenery Design often share YSSY gate layouts.

Cross-reference multiple sources to confirm exact positions. Discrepancies of a few meters are common; prioritize official charts for safety-critical areas like runway-adjacent parking positions.

Designing Parking Spots with Airport Design Editor (ADE)

Airport Design Editor (ADE) is the standard tool for modifying AeroSimulations airports. It provides a graphical interface to place, edit, and export parking spots. Follow these steps to design custom spots at YSSY:

Loading the Default Airport

Open ADE and select File → Open Stock Airport. Navigate to YSSY Sydney Kingsford Smith. ADE will load the default BGL file, displaying runways, taxiways, and existing parking spots. Save a working copy (e.g., YSSY_Custom_Parking.apx) to avoid modifying the stock file directly.

Creating a New Parking Spot

From the toolbox, select the Parking tool. Click on the approximate location to create a spot. A properties dialog will appear. Enter the following key fields:

  • Name – Gate identifier, e.g., Gate B7.
  • Type – Choose from Gate (jetbridge), Ramp_GA (general aviation), Ramp_Cargo, etc.
  • Heading – True bearing the aircraft nose points (0–359). Derive from gate orientation on aerial imagery.
  • Radius – Typically 10–25 meters. Large aircraft (B747, B777) require 20–25 m; medium (B737, A320) 15–18 m; small (GA) 10–12 m.
  • Airline Codes – Assign ICAO codes (e.g., QFA for Qantas, VOZ for Virgin Australia) to control AI parking.
  • Pushback Options – Specify pushback direction (forward, backward, left, right) to align with taxiway flow.

Precisely position the spot by tweaking the latitude/longitude in the property grid. Use the Snap to Grid or Snap to Taxiway features for alignment. Check the distance to taxiways – the Service Road edge should not intersect the parking radius.

Batch Adding Multiple Spots

For efficiency, create a list of gates using an external spreadsheet or text editor. ADE supports importing CSV files with parking spot data. The required columns: Latitude, Longitude, Heading, Type, Radius, Name, AirlineCode. Use this method for large-scale modifications like the entire international terminal (T1) at YSSY.

Creating the Necessary Files and Exporting

After designing all parking spots in ADE, you must export the scenery to a format that AeroSimulations can read.

Exporting as a BGL File

In ADE, go to File → Compile → Compile BGL. Choose a destination folder (e.g., the scenery folder of your add-on). ADE will generate a .bgl file containing only the parking spot definitions (if you also modified runways/taxiways, those will be included; it’s best to keep parking spots in a separate file for easier updates). Name it something like YSSY_Custom_Parking_Only.bgl.

Manual XML Creation (Alternative)

Power users can write the XML directly. An example fragment for one parking spot:

<?xml version="1.0" encoding="utf-8"?>
<FSData version="9.0">
  <Airport ident="YSSY">
    <TaxiwayParking name="Gate A1" lat="-33.946111" lon="151.177222" heading="270.0" radius="18.0" type="GATE" airlineCodes="QFA" pushback="TO_TAXIWAY">
    </TaxiwayParking>
  </Airport>
</FSData>

Save this as an .xml file and compile it using the SDK’s BGLComp.exe tool, or use a batch converter. Note that coordinates must be in decimal degrees.

Adding the Custom Parking Spots to the Scenery Configuration

Once the .bgl file is ready, you need to ensure AeroSimulations loads it with higher priority than the default airport.

  1. Create a new folder structure: Addon Scenery\YSSY Custom Parking\scenery\ and place the .bgl file inside.
  2. Launch AeroSimulations, go to Settings → Scenery Library (or equivalent menu).
  3. Click Add Area and browse to the Addon Scenery\YSSY Custom Parking folder. Set the priority to load after the default scenery but before any photoreal overlays. A typical priority level is 1000.
  4. Apply the changes and restart the simulator to reload the scenery.

If you have multiple airport add-ons for YSSY (e.g., payware terminals), ensure your custom parking .bgl loads after the base airport to override default gates. You can rename the file with a z prefix (e.g., zYSSY_Custom_Parking.bgl) to force it to load last alphabetically.

Validation and In-Sim Testing

Testing is critical to confirm that parking spots function correctly and do not create conflicts.

Visual Inspection

Load the simulator at YSSY in a top-down view (Shift+Z cycle). Look for your custom parking spots – they appear as yellow circles or parking T-marks depending on the sim version. Verify the gate numbers match your design. Fly around or use slew mode (Y key) to check from the ground perspective.

Functional Testing

Spawn an aircraft at each new parking spot. Use the Map view to confirm the aircraft aligns with the designated heading and sits within the gate radius. If you assigned airline codes, request AI aircraft from that airline to see if they park at the correct gate. Common issues:

  • Aircraft too large for radius – Increase the radius value.
  • Aircraft clipping into jetbridges – Adjust the node’s parking radius or move the spot slightly.
  • Pushback path intersects taxiway – Change pushback direction from TO_TAXIWAY to LEFT or RIGHT to direct the aircraft initially away from traffic.

Checking for Interference with Default Parking Spots

If default parking spots still exist, they may occupy the same coordinates. Remove or reposition them using ADE. Open your custom .apx, select all default parking spots (usually in a separate layer), and delete them. Re-export only the custom spots. This step ensures your custom gates take precedence.

Advanced Customizations for Realistic Operations

To elevate the realism further, consider these advanced modifications:

Multiple Parking Spot Types for Same Physical Location

Some real gates can handle different aircraft types by moving the jetbridge. Create two spots with slightly different radii and heading offsets, both marked as Gate. Assign the same gate number but different type or airline codes (e.g., Gate A1 (Heavy) and Gate A1 (Medium)) and place them overlapping. The simulator will choose the best fit based on aircraft dimensions.

Adding Support Structures (Visuals)

Parking spots themselves are invisible beyond the T-mark. To add jetbridges, fuel pits, or ground power units, you need external 3D models placed as Scenery Objects in ADE. These objects are typically part of terminal add-ons. Coordinate the parking spot’s center with the object anchor point.

Dynamic Parking Assignments via AFCAD

In older AeroSimulations versions, the AFCAD file (airport facility data) controlled parking assignments. Modern simulators use BGL files with built-in AI logic. You can set Parking Priority and Time Restrictions in ADE to simulate peak-hour gate usage. For example, a cargo gate might be restricted to nighttime operations only.

Best Practices and Community Resources

Finalize your work with these professional-grade habits:

  • Version control – Keep incremental backups (YSSY_v1.apx, YSSY_v2.apx) to revert if updates break compatibility.
  • Document your changes – Maintain a spreadsheet mapping gate names, coordinates, and airline assignments for future reference.
  • Test with default AI traffic – Use a standard AI traffic package (like AIG or MTL) to ensure your parking spots work universally, not just for your fleet.
  • Share with the community – Upload your finished .bgl to forums like Flightsim.to or the AeroSimulations Scenery Catalog. Provide a readme file with credits and usage notes.

Engaging with active online communities is invaluable. The Freeflight Forum and Scenery Design for AeroSimulations Facebook groups offer troubleshooting tips and ready-made gate templates. Check the official AeroSimulations Developer Tools page for the latest SDK updates if you encounter parsing errors.

Conclusion: Mastering Custom Airport Parking

Adding custom aircraft parking spots at Sydney Kingsford Smith Airport in AeroSimulations is a rewarding process that transforms a generic airport into a living, breathing hub. By gathering precise reference data, using Airport Design Editor for accurate placement, and methodically testing each gate, you can create a parking layout that mirrors real-world operations. The steps outlined in this guide – from coordinate system fundamentals to advanced pushback configurations – provide a repeatable framework that applies to any airport in the world. With patience and attention to detail, your custom YSSY scenery will deliver an immersive simulation experience for yourself and the community.