How to track indoor rowing distance and split on a Garmin without a connected erg
If you row on a basic gym machine that can't pair with your watch, Garmin gives you stroke rate and heart rate — but no distance and no split. Here's why, and how to estimate both using only the watch.
You start a Garmin Indoor Rowing activity, pull hard for twenty minutes, and finish with almost nothing to show for it: a heart-rate trace, a stroke count, and a distance of zero. On a Concept2 or a connected rower this is a solved problem — the machine broadcasts its data. On the "dumb" ergs most gyms actually have, it isn't. This guide explains what's happening and how to get the number every rower cares about: the split per 500 m.
Why your Garmin shows no distance on a gym rower
A rowing machine doesn't have GPS, and indoors your watch's GPS is useless anyway. The only way a watch knows your distance and pace on an erg is if the machine tells it — over ANT+ or Bluetooth. Concept2's PM5 monitor and a handful of smart rowers do this. Most gym machines don't broadcast anything, so Garmin has no signal to turn into meters. It records what it can measure directly — heart rate from the wrist and stroke rate from arm motion — and leaves distance and pace blank.
That's not a bug you can fix in settings. Without a data source, the watch simply can't report a distance it never received.
The workaround: estimate split and distance from your watch
There is one number your watch does compute during any activity: your energy expenditure. Row Estimate is a free Connect IQ data field that works backwards from that. It inverts the well-known Concept2 relationship between calories, power and pace — the same math Concept2 publishes — to turn your watch's energy-burn rate into watts, and watts into a pace and a distance.
While you row it shows, live on the data screen:
- Estimated split per 500 m — the pace rowers actually think in.
- Estimated total distance.
- Meters per stroke, so you can watch your efficiency.
It also writes the estimated distance back into the FIT file, so after the workout Garmin Connect shows a distance chart and a total instead of a blank.
How to set it up
- Install Row Estimate from the Connect IQ store.
- On your watch, open Indoor Rowing → Activity Settings → Data Screens and add "Row Estimate" as a data field.
- Start rowing. The estimate settles in after about 20–30 seconds of steady data.
How accurate is it — and how to make it closer
Because the estimate is driven by your watch's calorie model, it tracks effort well but can read a little fast or slow depending on your machine and your body. Row Estimate includes a 50–150% calibration setting: do one piece where you know your real split (for example on a Concept2), then nudge the calibration until Row Estimate agrees. From then on it's anchored to a machine you trust.
Who this is for
Anyone doing steady-state or interval rowing on a gym erg that won't connect — CrossFit rowers, cross-trainers, and people who just want their Garmin history to show meters instead of zeros. If your machine already pairs over ANT+ or Bluetooth, use that; you don't need an estimate. If it doesn't, this is the closest you'll get without buying new hardware.
Row Estimate
Free Garmin data field. Estimated split /500 m, distance and meters per stroke on ergs that can't pair — no account, no phone during the workout.
Free, and it stays free
Row Estimate has no paywall and collects no data. If it earns a spot in your training, you can support the next improvement.