Read AirTag data from the FindMy.app cache and convert to GPX

airtag-to-gpx-sync.sh

#!/usr/bin/env bash

# 
# Reads AirTag data from the FindMy.app cache and converts it to a daily GPX file
#
# Rsyncs the data to a web accessible folder that can be displayed with e.g. 
# https://gist.github.com/henrik242/84ad80dd2170385fe819df1d40224cc4
#
# This should typically be run as a cron job
#

set -o pipefail -o nounset -o errexit

export PATH=/usr/local/bin:$PATH
DATADIR=/tmp/airtag-data
TODAY=$(date +%d)

mkdir -p $DATADIR
DATA=$DATADIR/airtagdata-$TODAY.txt
GPX=$DATADIR/airtagdata-$TODAY.gpx
TAGNAME=Foobar

if [[ $(uname -s) == "Darwin" ]]; then
  TOMORROW=$(date -v +1d +%d)
else
  TOMORROW=$(date --date="tomorrow" +%d)
fi
rm -f $DATADIR/airtagdata-$TOMORROW.gpx

jq -r '.[] | select(.name == "'$TAGNAME'") | .location | "\(.latitude) \(.longitude) \(.altitude) \(.timeStamp/1000 | todate)"' \
   $HOME/Library/Caches/com.apple.findmy.fmipcore/Items.data >> $DATA

START='<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" xmlns:mytracks="http://mytracks.stichling.info/myTracksGPX/1/0" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" creator="myTracks" version="1.1" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">
   <trk>
      <name>'$TAGNAME'</name>
      <extensions>
         <mytracks:color red="0.000000" green="0.000000" blue="1.000000" alpha="1.000000" />
         <mytracks:area showArea="no" areaDistance="0.000000" />
         <mytracks:directionArrows showDirectionArrows="yes" />
         <mytracks:sync syncPhotosOniPhone="no" />
         <mytracks:timezone offset="120" />
      </extensions>
      <trkseg>'

END='      </trkseg>
   </trk>
</gpx>'


echo $START > $GPX 

function elems() {
    LAT=$1
    LON=$2
    ELE=$3
    TS=$4
}

cat $DATA | while read line; do
  elems $line
  echo '<trkpt lat="'$LAT'" lon="'$LON'">
            <ele>'$ELE'</ele>
            <time>'$TS'</time>
         </trkpt>' >> $GPX
done

echo $END >> $GPX
cp $GPX $DATADIR/airtagdata.gpx

rsync -a --exclude='*.txt' $DATADIR example.com:public_html/airtag/

A full decryption tool for macOS 14.4+ FindMy cache data has been published at https://github.com/Pnut-GGG/findmy-cache-decryptor

Were you able to get it working?
I've been testing it, but the key I retrieved from the keychain doesn't successfully decrypt the data.
Despite multiple attempts to regenerate or extract alternative keys, decryption consistently fails with an invalid tag error

invalid tag error

That's discouraging, what version of MacOS did you try this on?

invalid tag error

That's discouraging, what version of MacOS did you try this on?

I'm getting the same error too. Do you know if there's any way to get around it?
It's happening to me on macOS 14.7.6 and 15.5
@hubert3

@marcelosanchez Maybe try posting an issue at the repo