Garmin Xero C1 Pro: A Standalone Chronograph That Lives on Your Bow

Getting an accurate arrow speed reading traditionally requires either a standalone chronograph positioned a few feet downrange or a trip to a pro shop. Neither is trivial — a standalone requires setup, a consistent shot lane, and someone to watch the reading while you shoot. A pro shop visit means scheduling around someone else's calendar. The Xero C1 Pro changes the equation by mounting directly to the bow's sight rail and reading velocity as the arrow passes through the sensor field. No target, no second person, no special setup.

What's notable

The C1 Pro mounts on a standard 1.75-inch dovetail or side-bar mount and reads velocity through optical sensors that detect the arrow passing through a defined gate. Garmin quotes a velocity range of 100–400 fps, covering every compound bow in current production and most crossbows. Accuracy is within 0.1% of actual velocity — that's ±0.3 fps at 300 fps, tighter than most commercial chronographs at twice the price. The display is a small LED panel on the unit itself and also syncs via Bluetooth to the Garmin Hunt app on a phone for logging individual shots and tracking velocity over time.

What makes the C1 Pro genuinely useful rather than just novel is the ability to track velocity changes across a session. If your arrow speed drops from 298 fps to 291 fps across 30 shots, that's a limb bolt, string creep, or cam timing issue worth diagnosing before it gets worse. Without a bow-mounted chronograph, a 7 fps drop is invisible until arrows start hitting differently and you're troubleshooting a mystery. The Garmin app also accepts the velocity reading directly for trajectory calculation if you're running a Garmin Xero A1i sight, creating a closed-loop system where the sight's aim points are calibrated from live-measured speed rather than estimated IBO spec.

Battery life is quoted at 1,000 arrow shots per charge via USB-C, which means a heavy shooting season — 20 shots per session, three sessions per week — lasts roughly 16 weeks between charges. The sensor is waterproof to IPX7, handling submersion to 1 meter for up to 30 minutes. In practice this means rain and condensation aren't concerns. The unit weighs 2.6 ounces, which is light enough that it doesn't require rebalancing the bow's stabilizer setup. Data logged through the Garmin Hunt app includes session date, individual shot velocity, and session averages — exportable as a CSV for archers who track their setup over time in a spreadsheet or want to correlate velocity data with scoring results.

Who it's for

The C1 Pro has two clear use cases. First: archers who tune frequently and want immediate velocity feedback without setting up a chronograph. A technician dialing spine selection, optimizing point weight for FOC, or comparing arrow brands can get a velocity reading on every shot without leaving the shooting line. The speed data paired with group results produces arrow selection decisions grounded in actual numbers rather than chart-based estimates.

Second: hunters who want to confirm arrow speed after any change to their setup — new arrows, changed point weights, limb adjustment, string stretch — before going afield. Keeping a velocity baseline removes one variable from the equation when arrows suddenly group differently. Casual shooters with fixed setups who never change anything will get less value from the real-time data, but archers who regularly experiment with their equipment will find the C1 Pro pays for itself in time saved.

The first-look video

Where it sits in the lineup

The C1 Pro is Garmin's only standalone chronograph product. In the market, it competes with the MagnetoSpeed bow attachment, which attaches near the arrow rest rather than the sight rail and reads via magnetic sensor. Both approaches work; the Garmin's optical system doesn't require fitting around the arrow rest geometry, which simplifies installation on bows with unusual rest configurations. The C1 Pro is the more expensive option in that comparison, but the more complete integration for archers already using the Garmin Hunt app or a Garmin Xero sight. Garmin also offers firmware updates for the C1 Pro via USB-C, so accuracy improvements and new profile features are available after purchase without buying a new unit. The C1 Pro is also compatible with Garmin's Connect IQ platform for third-party app integrations, including shooting log apps that can correlate velocity data with target face photos taken at the session.

Source

Product specifications via Garmin. Video review via Lancaster Archery Supply.

Tagged: Sights · Garmin Xero · 2024