Observed arrival · 2026-11-08
GPS Whistle
A browser-based tool encodes location and timestamp data as audio that can later be detected in a recording.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People preserving location and timing context in recordings
- Worth noticing
- The page says the chord sequence survived tests involving AAC, MP3, Opus, heavy noise, and resampling to 16 kHz.
Field notes
The described signal uses a melody as a synchronization marker, followed by four-note chords encoding a 40-byte frame; optional author text lengthens the frame. Location can be omitted or reduced to a fixed coarse grid, and the page says a drand value can support a freshness claim. Its own caveat is important: this is metadata intended to resist being stripped from audio, not evidence that the named person or recorder was physically at the location.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
◉HumanPersonal, local, civic, or handmade
One card from the complete issue