Updating trail data

Use SAM’s map app Breadcrumb feature to collect trail data for new trails, reroutes or updates.

If you don’t have it already, download the map app.

Be sure your battery is fully charged. It’s a good idea to have a charger nearby (in your vehicle) in case the battery gets low.

You have choices of 50, 100 and 200 feet for the Breadcrumbs. Go with 50 feet for the most accurate collection.

Do not capture multiple trails on a single Breadcrumb file.
One trail, one Breadcrumb. Capture and save one trail at a time, so we understand the data. If an individual trail is extremely long, you can break it up into multiple Breadcrumb files but try to record for as long as possible. Each individual trail, or major section of a trail, should be saved as an individual file (see “Important” below for naming convention). Never combine multiple trails into a single file.

Remember to start/stop data collection for each unique trail and save that individual file.


If you get a warning to enable GPS when the app is launched, go to Settings tab at the bottom of the map app, then scroll down to GPS, and activate. See “Location Services and GPS” below for additional information.

Tap on the GPS blue dot to start tracking. If you don’t see the blue dot, tap “Center” at the bottom of the screen. You can enable “Centering” permanently in the Settings tab.

Tap the small gray zig-zag box in the Current Location pop-up, choose Breadcrumb Tracking.

Saving and Naming Files
After you finish mapping a particular route, tap the box with the downward arrow at the top right of the screen to stop the tracking. Save the route, naming it in this exact format: Club Name, Route Number. Example: Hadley RT5.

Important: Naming Multiple Files
Each file must have a different name, otherwise you risk losing data. Say you are mapping a single trail (RT5) over the course of a day (or days) and have it broken into large sections, with multiple breadcrumb files. You will need to add a prefix to each saved file. You can’t name each file “Hadley RT5.” Instead add a space and an additional number after the route: Hadley RT5 01, Hadley RT5 02, Hadley RT5 03, and so on. Each breadcrumb file must have it’s own unique name.

Tap on the compass in top corner. Tap again when done tracking (on the blue dot or compass) and save your path, naming it using the same file convention as written above.

If an old trail is being “deleted” from the map, it’s vital that you send us a breadcrumb of the deleted section with a written explanation. The breadcrumb must be exact and named in the convention outlined above. You must also send a separate file of the new route.

Why does location services run in the background when the app is active?
There are three options for location services in the iPhone Settings – “Always” “Never” or “When Using”. In order for breadcrumb tracking to work in the background it must be set to the “Always” option. If you choose “When Using” it will stop recording if the app goes into the background, such as during a text, call or if you open another app.

To counteract this you can simply enable/disable the GPS option in the app itself. Open the map app, go to the settings tab at the bottom and turn the GPS on or off. This will preserve the battery if you want the map open but without GPS functionality.

We suggest you quit the app after your snowmobile ride to end the session and preserve battery life.

Any handheld recreation grade GPS receiver will also be able to record your trail data – Garmin, Magellan, DeLorme. Tracks can be captured and sent to us in .gpx format. Just capture one distinct trail at a time and identify that trail in the filename, as detailed above. Most GPS receivers come with software, so you can view your saved tracks on a computer or Google Earth.

Don’t stop while recording data. If you sit idle on a sled or stop walking you will still be collecting GPS data and that data will bounce around a bit, creating a snarl of points. So, try not to stop in the middle of collecting trail data (to blow your nose, take a phone call, send a text, etc). We realize things come up and you have no choice but it will make a mess of the data and may need to be redone. You are better off saving as soon as you stop. It’s best to plan your stops at intersections and save the file.

There is a cost to update the map. In the name of efficiency we wait until we have a sufficient amount of data from all the clubs. Updates will typically take place once every year or two.

Saved routes can be emailed to SAM from within the app, in .kml format. Be certain the are named correctly.
Email files to Rena

See our map FAQ page for general app information.