Track3D Guide
Using Garmin inReach for Ultramarathon Race Tracking
Ultramarathons are often held in remote areas where mobile coverage is limited or disappears completely. When that happens, crews can lose contact with their runner for long periods and may not receive another location update until the runner reaches coverage again.
That creates a real problem for crews. They need to be at checkpoints before their runner arrives, but without reliable race progress they often have little choice but to arrive early and wait. Sometimes for hours. They watch runner after runner come through, trying to work out whether theirs is next.
From plan to race day
Track3D approaches the problem by starting before race day. The Track3D Race Planner lets the runner build a Race Plan from the course, including checkpoints, cutoffs, expected timing and the information their crew will need along the way.
During the race, Track3D uses satellite location updates from Garmin inReach and matches them to that Race Plan. Instead of showing the crew only a dot on a map, Track3D can show where the runner is in the race, which checkpoint is next, when they are likely to arrive, how they are tracking against cutoff and what the crew needs to do when they get there.
Why wouldn’t I just use Garmin LiveTrack or MapShare?
You can. If all your crew needs is to see where the runner is, Garmin LiveTrack or MapShare may be enough. They are useful location sharing tools that can show the runner’s current position and tracking trail.
What they do not know is your Race Plan. They do not tell the crew which checkpoint is next, when the runner is expected to arrive there, the current Finish ETA, how the runner is tracking against cutoff, what checkpoint notes you prepared, or when the crew needs to start getting ready.
Track3D takes the runner’s location and puts the race around it. It matches each tracking update to the course and Race Plan so the crew sees not just where the runner is, but what that location means for the race.
Satellite communicator
What is Garmin inReach Mini?
Garmin inReach Mini is a compact satellite communicator that can send location updates beyond normal mobile coverage. In an ultramarathon context, it can keep transmitting the runner’s position when reception disappears. Track3D then uses those location points to match the runner to the course and turn them into race progress, checkpoint context, Adaptive ETA, alerts and crew-ready information.
- Satellite tracking beyond normal mobile coverage
- Compact device suited to remote races and long days out
- Track3D adds the race context crews actually need
Can a Garmin inReach track an ultramarathon runner?
Yes. Garmin inReach satellite communicators can send track points containing the device location to Garmin’s online tracking service. Garmin describes a 10 minute send interval as the normal default on many inReach products, while selected plans and devices can support a 2 minute interval.
That makes inReach especially useful on trail and ultramarathon courses where mobile coverage is intermittent or absent. The runner does not need a mobile data connection for the inReach tracking point itself to leave the course. The device uses satellite communication, subject to normal satellite conditions and a sufficiently clear view of the sky.
The important word is interval. This is not continuous second by second GPS streaming. A 10 minute tracking setting means a new satellite track point is normally sent on that schedule. A 2 minute setting gives the crew a more frequently refreshed picture, but availability, battery impact and any usage charges depend on the Garmin device and subscription plan.
An inReach may record GPS data locally more frequently than it sends points by satellite. For live remote tracking, the points that matter are the ones actually transmitted and made available through Garmin LiveTrack or MapShare. Track3D cannot turn a locally recorded point that has not been transmitted into a live crew update.
Garmin LiveTrack and MapShare show the runner. Track3D adds the race.
Garmin’s own LiveTrack and MapShare are useful location sharing tools. With inReach, they can let crew follow the runner’s transmitted satellite track and most recent location in a browser.
If the question is simply “Where is the runner?”, that may be enough.
Ultramarathon crews usually need answers beyond the location itself. They need to know where the runner is on the actual race course, which checkpoint comes next, when the runner is likely to arrive there, what the current Finish ETA is, how much cutoff buffer remains and what the crew planned to do when the runner gets there. Garmin’s sharing view does not know the runner’s Track3D Race Plan. That is the layer Track3D adds.
| Race day question | Garmin LiveTrack / MapShare | Track3D Crew using inReach |
|---|---|---|
| Where is the runner? | Shows the transmitted Garmin location and tracking trail. | Uses the inReach location as tracking evidence. |
| Where are they in the race? | Shows location on a map, but has no Track3D Race Plan awareness. | Matches the observation to the Track3D race course and shows race progress. |
| Which checkpoint is next? | Does not derive the next Track3D checkpoint from the Race Plan. | Shows the authoritative next checkpoint from the Race Plan. |
| When will they reach the next checkpoint? | No Track3D Adaptive ETA to the planned checkpoint. | Adaptive ETA moves as new race progress arrives. |
| What is the Finish ETA? | No Track3D Finish ETA based on the live race picture. | Shows the updated Finish ETA alongside checkpoint progress. |
| How are they against cutoff? | No Track3D cutoff context from the Race Plan. | Shows cutoff status and remaining buffer. |
| What does the crew need to do there? | No Track3D checkpoint notes or crew plan. | Checkpoint notes, crew instructions and alerts travel with the race. |
| Satellite messaging and SOS | Garmin inReach provides Garmin messaging and SOS functions. | Track3D does not replace Garmin messaging, SOS or emergency services. |
No. Track3D matches the inReach observation against the course already stored with the Track3D Race Plan. You can still share a planned route through Garmin LiveTrack or MapShare if you want to use Garmin’s own map features, but Track3D does not depend on Garmin’s route display as its race course authority.
How Track3D turns a satellite point into race progress
Track3D currently connects to Garmin inReach through the account’s authorised MapShare Raw KML feed. The connection is read only. Track3D does not change Garmin device settings, send commands to the inReach or replace Garmin’s own tracking service.
The distinction matters. Garmin supplies the satellite location evidence. Track3D supplies the race model around it. A coordinate such as a latitude and longitude becomes something the crew can act on: the runner is 71 km through the course, the next checkpoint is 8 km away, and the expected arrival has moved later as the runner has slowed.
What to set up before race day
Satellite tracking should be tested before the runner reaches the start line. A working setup needs both the Garmin side and the Track3D side ready.
- A compatible Garmin inReach with an active subscription. Confirm the tracking interval available on the runner’s device and plan.
- Garmin tracking enabled and working. Send real outdoor tracking points and confirm they reach Garmin before relying on them during a race.
- The authorised MapShare feed configured in Track3D. Track3D stores the account connection privately and uses it read only.
- A Track3D Race Plan with the correct course. The race course, checkpoints, cutoffs and crew information provide the context that the satellite point alone cannot provide.
- The Track3D Crew race set up and the tracker tested. Do the end to end test with the actual inReach that will be carried on race day.
- Crew connectivity considered. The runner can send the inReach point by satellite without mobile reception, but the crew still needs internet access to receive updated Track3D information.
Do not stop at seeing a dot in Garmin LiveTrack or MapShare. Test the complete path you intend to use: inReach outdoors, Garmin receives the point, Track3D receives it, the point matches to the course and the crew view updates.
Should you use 2 minute or 10 minute tracking?
There is no single correct interval for every ultramarathon. Garmin makes the available intervals dependent on the device and subscription plan, and faster satellite tracking can affect battery use and plan usage.
10 minute tracking
A common default on inReach products. It gives the crew a lower frequency but useful remote picture and can suit very long events where battery life matters. Track3D recalculates the race picture when each new observation arrives.
2 minute tracking
Available on selected Garmin plans and devices. More frequent satellite points let race progress and ETA respond sooner, but the runner should confirm plan eligibility, battery expectations and any usage implications before race day.
Track3D does not invent extra satellite locations between Garmin updates. If the inReach sends every 10 minutes, Track3D cannot turn that into true 60 second satellite tracking. What Track3D can do is make each real point more useful by understanding where it sits in the race.
What happens when mobile reception disappears?
This is where inReach becomes especially valuable. The inReach satellite path is independent of the runner’s mobile data connection. If the runner leaves mobile coverage but the inReach continues normal satellite operation, new satellite track points can still reach Garmin and then Track3D.
The crew side is different. Track3D Crew is an online service. A crew member who is also in an area without mobile data or WiFi cannot receive new remote updates until their own internet connection returns.
The runner does not need phone reception for the inReach source. The crew still needs internet to see the updated Track3D race picture.
Garmin Watch and inReach can work together
Track3D is designed so a runner does not need to choose one tracking source for the entire race. Garmin Watch and Connect IQ can contribute updates approximately every 60 seconds when the paired phone has suitable connectivity. Garmin inReach can independently contribute satellite observations at the selected 2 minute or 10 minute interval beyond mobile coverage, subject to normal satellite operation.
Both sources contribute to the same race picture. Track3D does not treat this as a simplistic permanent “watch primary, inReach backup” arrangement. Each valid observation is evidence about the runner’s progress.
What Garmin inReach race tracking is not
Satellite tracking is powerful, but it should not be described as something it is not.
- It is not continuous real time GPS. Updates arrive at the selected tracking interval and can be delayed by normal satellite conditions.
- It is not guaranteed in every location. Terrain, buildings, deep valleys and tree cover can affect satellite communication.
- Track3D is not an emergency monitoring service. Garmin inReach SOS and emergency functions remain Garmin functions and should be used according to Garmin’s instructions.
- Track3D does not replace Garmin LiveTrack or MapShare. They remain Garmin’s own tracking and sharing services. Track3D adds race specific interpretation.
- It is not official race timing. Track3D uses location evidence to estimate race progress and ETA. Official checkpoints and timing systems remain authoritative for official results.
Why this matters to a crew
Imagine the runner has been outside mobile coverage for more than an hour. A new inReach point arrives. Garmin LiveTrack or MapShare can show the crew where that point is. Track3D can also show where it sits in the race, which checkpoint is next and whether the runner’s expected arrival has shifted.
If the runner has slowed through a difficult section, Adaptive ETA can move with the observed race. That can be the difference between a crew leaving too early and waiting for hours, or arriving at the right checkpoint with the right food, gear and instructions ready.
That is the purpose of using inReach inside Track3D Crew: not to replace the satellite tracker, but to make the satellite location useful in the context of the race.
Frequently asked questions
Does the runner need a phone for Track3D inReach tracking?
The inReach satellite tracking source does not depend on the runner having mobile reception. Track3D reads the Garmin feed server side. The crew still needs an internet connection to receive remote updates.
Do I have to upload the race GPX to Garmin LiveTrack or MapShare?
Not for Track3D course matching. Track3D uses the course already associated with the Race Plan. You can still share routes or collections through Garmin if you also want Garmin’s own map features.
Does Track3D replace Garmin LiveTrack or MapShare?
No. They remain Garmin’s own location sharing products. Track3D adds race progress, next checkpoint, Adaptive ETA, Finish ETA, cutoff context, checkpoint notes and crew planning around the location evidence.
Is 2 minute tracking required?
No. Track3D supports the real observations Garmin provides. A 10 minute inReach interval can still be useful for remote ultramarathon crewing. A 2 minute interval gives a more frequently refreshed picture where the Garmin plan and device support it.
Can Garmin Watch and inReach both be used in the same race?
Yes. Track3D is designed to accept both as concurrent sources. The watch can provide more frequent observations in suitable mobile coverage while inReach can continue contributing through satellite tracking beyond it.
Garmin device capabilities, tracking intervals, subscription inclusions and charges can change. Confirm the current settings for your device and plan with Garmin before race day. Garmin inReach tracking can be shared through LiveTrack or MapShare depending on the account setup. Garmin’s official MapShare feed documentation is available at Garmin MapShare Feeds.
Already have an inReach? Start with the Race Plan.
Track3D begins with the course, checkpoints, cutoffs and timing. Track3D Crew carries that context into race day and adds live tracking when the runner starts moving.
Open Race Planner
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