Setup guide

Share one display between drivers

A Gantry Display isn't limited to one driver. Any number of phones can pair with it, and adding a new one doesn't disturb the phones already paired — everyone just scans the same display's QR code once.

Only one phone drives at a time: pairing a phone doesn't mean it's always the one shown on the display. Whichever phone is connected to your car's OBU is the one driving the display — see "Who gets the display?" below for how that's decided.

Automatic hand-off needs display firmware v40 or later, on a phone running a matching Gantry app. The app will tell you when a display update is ready — open the Display tab and choose Display firmware to install it.

  1. Install the app on the new driver's phone

    The new driver installs the Gantry app and completes its setup. OBU pairing is done per phone in the app's Setup tab — that part is unrelated to the display and isn't covered on this page.

  2. Show the display's pairing QR again

    There are two ways to bring the QR code back up, depending on whether a phone is currently connected:

    No phone connected: briefly press the button on the display. The QR code appears for 60 seconds with a small countdown, and pressing the button again dismisses it early.

    A phone is already paired and connected: on that phone, go to the Display tab and choose Add another phone. The display shows its QR code — the first phone's connection stays up the whole time, so nothing is interrupted while the new phone pairs. Keep that screen open until the new phone has finished pairing.

    What the display shows while a pairing QR code is up.

  3. Scan it from the new driver's phone

    On the new driver's phone, open the Gantry app, go to the Display tab and choose Pair a display, then tap Scan QR code and point the camera at the QR code on the display. That's a one-time scan — from then on, this phone reconnects automatically whenever it's the one using the display.

Who gets the display?

Up to two paired phones can be connected to the display at the same time. Your OBU accepts only one phone, and whichever phone gets that OBU connection is the one that drives the display — it's the only phone with anything to show. The other phone stays connected quietly in the background: it shows a short note that another phone has the display, and it stops reaching for the OBU too, so the two phones aren't competing over it. If a third phone tries to join, it simply waits until one of the two spots frees up.

Handing off without leaving the car

Hand-off is automatic — there's no switch to remember. The display always follows whichever phone is connected to the OBU, so the moment the outgoing driver's phone loses that connection — most commonly because they've stepped out of the car — the other phone takes over the display within moments. Both phones can stay paired and connected the whole time; only the one actually reading the OBU takes the screen.

Removing a driver. A phone can bow out on its own via the Display tab → Forget this display → Forget on this phone only — the other drivers keep working as normal. To revoke access for everyone at once, reset the display's pairing by holding its BOOT button for about 8 seconds until the QR code reappears; any remaining drivers then scan the new QR code once to re-pair.

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