Module field15 

ICAO Field 15 Parser

This module parses ICAO Field 15 entries from flight plans. Field 15 contains the route description including speed, altitude, waypoints, airways, and various modifiers.

Based on ICAO DOC 4444 specifications and implements the three basic token types:

• Points: Published Route Points (PRP), lat/lon coordinates, Point/Bearing/Distance, Aerodrome
• Connectors: ATS routes, SID, STAR, DCT, VFR/IFR, OAT/GAT
• Modifiers: Speed and Level changes

The parser tokenizes the input string, identifies each token type, and constructs a structured representation using Rust enums and structs.

Acknowledgement

This parser is inspired by and adapted from the Python implementation available at https://github.com/pventon/ICAO-F15-Parser/

Example

The following field 15 entry:

N0490F360 ELCOB6B ELCOB UT300 SENLO UN502 JSY DCT LIZAD DCT MOPAT DCT LUNIG DCT MOMIN DCT PIKIL/M084F380 NATD HOIST/N0490F380 N756C ANATI/N0441F340 DCT MIVAX DCT OBTEK DCT XORLO ROCKT2

becomes a structured sequence which serializes to JSON as follows:

[
  {"speed": {"kts": 490}, "altitude": {"FL": 360}},
  {"SID": "ELCOB6B"},
  {"waypoint": "ELCOB"},
  {"airway": "UT300"},
  {"waypoint": "SENLO"},
  {"airway": "UN502"},
  {"waypoint": "JSY"},
  "DCT",
  {"waypoint": "LIZAD"},
  // (truncated)
  {"waypoint": "PIKIL"},
  {"speed": {"Mach": 0.84}, "altitude": {"FL": 380}},
  {"NAT": "NATD"},
  {"waypoint": "HOIST"},
  // (truncated)
  {"waypoint": "XORLO"},
  {"STAR": "ROCKT2"}
]

Usage

use thrust::data::field15::{Field15Element, Field15Parser};

let line = "N0490F360 ELCOB6B ELCOB UT300 SENLO UN502 JSY DCT LIZAD";
let elements: Vec<Field15Element> = Field15Parser::parse(&line);
match serde_json::to_string(&elements) {
    Ok(json) => println!("{}", json),
    Err(e) => eprintln!("JSON serialization error: {}", e),
}

Structs

Field15Parser

A parser for ICAO Field 15 route strings

Modifier

A modifier that changes flight parameters

Enums

Altitude

Altitude representation

Connector

A connector between points (airway or direct)

Field15Element

A single element in a Field 15 ICAO route

Point

A point in the route (waypoint, coordinate, or navaid)

Speed

Speed representation