Geo-Referenced PDF Maps: Navigate Offline With Your GPS

A geo-referenced PDF map is a map your phone can locate you on. Unlike a screenshot, it carries the geographic coordinates of every pixel — so your GPS position shows up on it even with no bars of signal. It is the format US Crown Land generates for your trips in United States.

How it works

When you export, the map area you framed is saved as an image, then the EPSG:4326 coordinate system (WGS 84 latitude/longitude) is embedded into the file. The result is still an ordinary PDF and opens anywhere. But an app that understands that coordinate layer can overlay your real position on it in real time, using nothing but the phone's GPS chip.

A phone's GPS chip does not need the internet — it listens to satellites. What normally needs a connection is the map tiles being fetched as you pan. Carrying the map as a file removes that dependency, which is exactly why the format suits camping, hunting, fishing and hiking beyond the reach of a tower.

Opening a geo-referenced PDF on your phone

The PDF viewer built into iOS or Android will not read the geo-referencing: you will see the map, but no position. You need an app built for the format. We recommend BorealMaps, a geo-referenced PDF map reader made for the Canadian outdoors.

  1. On the interactive map, frame the area you care about and run the PDF export.
  2. Download the file from My Maps, or have it emailed to you.
  3. Open the PDF in BorealMaps and allow location access.
  4. Your position appears on the map. Put the phone in airplane mode to save battery — GPS keeps working.

Before you head out

Download your maps while you still have signal, and confirm they open correctly in your geo-referenced PDF reader before you leave the house. A map you have never tested is a map you cannot count on.

Frequently asked questions

It is an ordinary PDF file with a coordinate system embedded in it (here EPSG:4326, that is WGS 84 latitude/longitude). Every point in the image therefore maps to a real position on Earth, so a compatible reader can show your live GPS position directly on the map.

No, and that is the whole point of the format. The file is stored on your device and your phone's GPS chip works without cellular data. Download the map at home and it keeps working deep in the bush with no signal at all.

Your phone's built-in PDF viewer ignores the coordinates: it will render the map as a flat image with no GPS position. You need an app that understands geo-referencing, such as BorealMaps, and import the PDF file into it.

A screenshot is just an image — you cannot tell where you are on it. A geo-referenced PDF carries the projection data, so the app can draw a blue dot at your true position, exactly like a navigation app.

Yes. The PDF exported from US Crown Land keeps the legend colours, so crown land, parks and private land stay identifiable offline, along with any personal markers you added.
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