# Lappy v0.3.1 - four more built-in circuits

V2 Rev1.1 firmware adds **Guangdong International**, **Chengdu Tianfu**, **Erdos (Ordos)** and **Beijing Goldenport** to the offline Track catalog. Display names are GUANGDONG, CHENGDU TF, ERDOS and BEIJING. Track > COURSES > MORE reaches all nine factory templates; eight custom revision slots remain available, for 17 total entries. Factory courses need no SD installation.

Guangdong is the requested Guangzhou-area circuit in Zhaoqing. Chengdu uses Tianfu's operational 19-turn circuit. Beijing uses Goldenport's full circuit. All four additions have a directional start/finish gate and whole-lap timing; intermediate splits remain empty because no timing-distance evidence was qualified. No PB, history or reference trace is bundled.

Pack 2026.10.25-1 contains pinned WGS84 OpenStreetMap extracts with checksums, normalized editable routes, native LPT files and offline review maps. Published FIA/TCR maps guide layout, direction and approximate start/finish placement. Coordinates are not rescaled to match published lap lengths. See [pack provenance and limitations](../assets/tracks/china/README.md).

The original five course identities, native geometry and saved PB/reference filenames are unchanged. Existing custom files, timing policy, Street/Drag behavior, BLE/startup/power code and both E30 companion animations are preserved. The desktop simulator adds matching GPS replay scenarios for the four circuits. Release metadata derives factory/catalog counts from the pack.

Validation: ESP32-S3 target build; host ASan/UBSan regressions; 81 fragmented GPS replays across nine courses at 5/10/25 Hz and 0/+3/-3 m lateral offsets; two consecutive laps, sector sums, PB/live-delta checks and fault rejection; deterministic pack/source audit; native simulator selection, 17-entry pagination/wrap, persistence and custom-slot limits; 179 UI renders with Track label clipping checks; linked BLE stack and ATT dispatch audits including historical negative controls. Source and render comparisons with v0.3.0 are recorded in the package.

The four new courses are source-reviewed and tested with synthetic GPS generated from their routes. Their control-line positions are approximate, not surveyed or independently validated by recorded laps. No v0.3.1 binary was flashed or field-tested during this work. Physical timing accuracy, course/gate acceptance and device memory margins remain pending; see [hardware checks](HARDWARE_BENCH_v0.3.1.md).

Install `Lappy-v0.3.1-v2.lappy` with Lappy Updater for an application-only update on a recognized compatible V2 device. The package preserves the current partition layout and settings. Complete firmware/source artifacts are in the matching release ZIP.