WhereAmI sends GPS location from iOS to macOS. The app must be opened on both devices, and because Bluetooth is used to pass the GPS location from iPhone to Macbook, both devices must be in its Bluetooth range.

WhereAmI is an experiment to prove that it's possible to have offline Macbook (perhaps during cruise/travel), but with some way of getting GPS coordinates (useful for taking field notes with accurate location).

WhereAmI is a universal Swift app that works on macOS and iOS. For macOS, the two versions are provided: GUI and Command Line Interface (CLI) tool. The same codebase is used to run on both platforms.

This is R&D project, and is 100% vibe-coded with the LLM.

The same functionality could perhaps be accomplished by creating the iOS Shortcut where GPS location is fetched, put into a file, and the file is somehow transferred via Bluetooth to Mac.

Both devices must have the app installed. On iPhone, the app must be started, and please click the button first and authorize the access to location API. Macbook must be within Bluetooth range.

Press a "Request location" button on Macbook. The iOS app should ask you for permission to do it (screen below). If everything goes well, the Mac should show you the GPS coordinate.

To test the macOS CLI,

✗ ./build/cli/whereami-cli
[BLELocationClient] request rejected: bluetooth unavailable
[retry] bluetooth unavailable; waiting for power on (attempt 1)
[BLELocationClient] central powered on
[BLELocationClient] request started
[BLELocationClient] performRequest invoked
[BLELocationClient] starting scan
[BLELocationClient] discovered peripheral xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx rssi=-41
[BLELocationClient] connected to xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
[BLELocationClient] service discovered; discovering characteristics
[BLELocationClient] subscribing to response notifications
[BLELocationClient] writing request to xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
[BLELocationClient] arming response timer
[BLELocationClient] issuing fallback read for response characteristic
[BLELocationClient] notify state changed isNotifying=true
[BLELocationClient] received 174 bytes from peripheral
[BLELocationClient] got location lat=45.4263 lon=-132.1666 acc=8.46
{
  "horizontalAccuracy" : y.yyyyyy,
  "latitude" : 45.4263,
  "longitude" : -132.1666,
  "timestamp" : "2025-10-02T21:14:55Z"
}

The xxxxxxxx-xxxx-..... is the device identifier (for your iPhone), and it'll differ in your case. I also anonymized the location, which will differ for you based on where you are, physically. RSSI is a signal strength--that might be different too. The debug stuff is printed to STDERR. It's supported to do:

./build/cli/whereami-cli > geo.json

and then:

jq . geo.json

To build for macOS (UI and CLI) and iOS:

make mac
make ios
make cmd

Permission ask will look like this:

BSDv2

• Adam Koszek, adam@koszek.com
• https://www.koszek.com