Digital track files are now a normal part of hiking in Australia. Whether you are planning a route, recording where you went, or reviewing a walk after the fact, you will almost certainly come across GPX and KML files. These files are not navigation tools on their own. They are data containers that store where something went and when. Used well, they support good planning and post trip review. Used poorly, they can encourage blind following and false confidence.
This guide explains what GPX and KML files are, how they differ, and how to use them in a way that supports safe, independent navigation.
What a GPS track file actually is
A GPS track file is a digital record of geographic positions stored over time. Each position is recorded as latitude, longitude, elevation, and a timestamp. When joined together, these points form a line that represents movement across the landscape.
Track files do not know where tracks are, whether a route is safe, or whether access is permitted. They only record where a device thought it was at a given moment. Understanding this limitation is critical. The file is evidence of past movement, not a guarantee of suitability or safety.
GPX files explained
GPX stands for GPS Exchange Format. It is an open standard designed specifically for storing and transferring GPS data without loss. GPX files can hold far more than a simple line on a map.
A GPX file can contain several types of information. It may include waypoints such as trailheads, junctions, campsites, or water sources. It can include routes, which are planned point to point paths created before a walk. It can also include tracks, which are the recorded breadcrumb trail from an actual hike. Many GPX files also retain timing data, elevation changes, speed, and metadata about satellite reception.
The strength of GPX is that it preserves detail. When you want to review how long a section took, how steep a climb was, or where navigation became uncertain, GPX gives you the raw material to do that. For planning, it allows you to break a walk into segments, check distances between known features, and compare intended travel against a topographic map.
Why GPX matters for safety
GPX files matter because they allow you to understand terrain and effort, not just shape. In Australian conditions, where distances are long and tracks are often rougher than expected, this detail helps with realistic planning.
GPX data supports safety when it is used as a reference alongside a map and compass. It can help confirm where you are, estimate remaining distance, and review decision points. It should never replace situational awareness or basic navigation skills.
A common mistake is assuming that a GPX track represents the best or only way through an area. Many tracks are recorded off route, through private land, across closed areas, or under conditions that no longer apply. Fires, floods, regrowth, erosion, and track realignments all make older files unreliable if they are followed without question.
KML files explained
KML stands for Keyhole Markup Language. It was developed to annotate maps rather than to store raw GPS data. KML files are commonly used with Google Earth and similar mapping tools.
A KML file usually contains a line showing where a track goes, sometimes with simple labels or descriptions. It may include points of interest or visual styling, but it generally does not preserve detailed timing, speed, or sensor data. Think of KML as a visual overlay rather than a full activity record.
KML files are useful when you want to view a route in three dimensions, share a simple visual reference, or overlay a walk on satellite imagery. They are not designed for detailed analysis or precise navigation.
Choosing between GPX and KML
The choice between GPX and KML depends on what you are trying to do. If you care about accuracy, detail, and future reuse, GPX is usually the better choice. If you only need a simple line to visualise a walk in mapping software, KML may be sufficient.
In practical terms, most serious planning and recording should start with GPX. You can always convert a GPX file to KML later if you want a lighter, visual version. Converting the other way often means losing information that cannot be recovered.
Using track files for planning
When planning a hike, a track file should support your understanding of the map, not replace it. Start with a topographic map and identify the terrain, contours, watercourses, and likely navigation challenges. Only then should you look at a GPX track to see how others have moved through the area.
Pay attention to where the track aligns with known features and where it does not. Sections that cut across contours, drift away from ridgelines, or pass close to cliffs deserve scrutiny. Ask why the track goes where it does and whether that makes sense in current conditions.
Never assume that a downloaded track reflects a formed or maintained walking track. In Australia, many recorded routes are off track scrambles, historic lines, or exploratory walks. Treat them as evidence, not instruction.
Recording your own hikes
Recording your own track can be valuable, especially for reviewing navigation decisions later. A GPX recording lets you see where you slowed down, where you hesitated, and where the terrain changed character. This is useful for learning and for future planning.
When recording, remember that GPS accuracy varies. Tree cover, steep gullies, narrow valleys, and cloud cover can all affect results. A recorded track may drift tens of metres from your true position. This does not make the file useless, but it does mean it should not be treated as precise ground truth.
If you share your tracks, be clear about what they represent. Note conditions, experience level, and whether the route is on track or off track. Poorly described files are a common source of confusion and incidents.
Common mistakes and failure points
One of the most common mistakes is blindly following a line on a screen without cross checking against the landscape. This leads people onto spurs instead of ridges, into closed areas, or down steep ground they did not anticipate.
Another failure point is assuming that because a file exists, access is permitted. Track files do not reflect land tenure, seasonal closures, or current restrictions. That responsibility remains with the hiker.
A third issue is overestimating precision. GPS tracks are approximations. Near cliffs, creeks, or indistinct terrain, small errors can have large consequences if the file is treated as exact.
Using track files responsibly
Used well, GPX and KML files are powerful tools. Used poorly, they can undermine judgment. The safest approach is to treat them as one input among many.
Your primary navigation should always be based on understanding the terrain, reading a map, and observing where you are in real time. Track files should confirm, not decide, your movements. If what you see on the ground does not match the file, trust the ground.
In Australian hiking, independence matters. Files come and go. Batteries fail. Tracks change. Skills last. GPX and KML files are most valuable when they support those skills rather than replace them.
