File Format

This section documents the fixed-width text formats used to distribute swim meet entries and results. tunas parses both SDIF v3 (.cl2) via read_cl2 and the proprietary Hy-Tek (.hy3) format via read_hy3.

Supported Formats

• SDIF (.cl2) — The open Standard Data Interchange Format v3 established by USA Swimming and produced by Hy-Tek Meet Manager and TeamUnify. This guide is a complete field-level reference (covering all record types A0–Z0, registration D1/D2, and time-standard J0–J2 records) derived from the official spec.
• Hy-Tek (.hy3) — The proprietary, reverse-engineered results format used across Hy-Tek Meet Manager and Team Manager — the cross-validated sibling to .cl2. read_hy3 parses the fields confirmed in this reference into the same object graph.

Methodology

Both references document empirically verified behavior rather than just the published specifications. The deviations for .cl2 and the reverse-engineering details for .hy3 were derived from a large corpus of meet files from the Pacific Swimming (2013–2026) and Michigan Swimming LSCs, comprising 2,190 files and 6.35M records. Every documented divergence lists its observed occurrence rate.