Garmin Edge 520

Garmin Edge 520The Bryton Rider 310 has been okay, but since Strava ALWAYS throws out wheel sensor data from the device, and RideWithGPS totally mucks up the distance calculations, I decided I wanted something more reliable and versatile.

I wanted detailed mapping, but the Edge 1000 is just too damn big for me to be comfortable with it while mountain biking. I also wanted GPS+GLONASS for accuracy purposes. I’ve been seeing tracks from people using Edge 520’s and 1000’s in places I’ve ridden and had poor results, and the tracks on the newer models are bang-on accurate. I decided to purchase an Edge 520 because visual maps have been fine for me in the past. I’ve never really trusted bike GPSes to navigate me anywhere on their own. I’ve started programming Courses into my old Forerunner 310XT and it’s been passable. But with no reference except what I’ve already ridden, it’s a little limiting. The Edge 520 offers improvements in all those areas. And on the bike, I prefer physical buttons, since they’re less likely to be bumped, especially on the mountain bike.

I’ve had the Edge 520 for a couple weeks. Most of my rides with it have been 2-4mi commute rides. Simple to track, navigation is unnecessary. Today I had my first long road ride with it. I won’t get any mtb rides with it for a week or two, as I’ve got a century ride coming up in less than a week. I’ll add mtb ride impressions after I manage a couple of those.

Some friends of mine planned out a Memorial Day ride that would go around the circumference of the I-465 loop, which was renamed the USS Indianapolis Memorial Highway. Since we can’t ride our bikes legally on the interstate, we did a loop that stayed pretty close to it around the whole city. It’s just a hair over 85mi.

This would be a perfect ride to use the Edge’s Course navigation along with a map. I loaded topo maps on the Edge 520. Since I can’t navigate on roads, I wanted as much map data as possible without swapping maps all the time. I used topo maps from and loaded them more or less according to the procedures described here and here. Loading topos from onto the Edge 520 has a couple of quirks. So you download the maps you want from gpsfiledepot, which requires you to install them and then access them through Garmin’s software. Either Mapsource or Basecamp. Surprise, neither program recognizes the Edge 520 as a possible location to save maps. Nor do Mapsource or Basecamp permit you to save maps onto your computer’s hard drive. I figured out quite by accident that the programs DO permit you to save maps onto memory cards. So in order to use these maps, you have to have a memory card inserted into a card reader. I did not test it with a USB thumb drive. That may or may not work.

Once you manage to save the maps you want, pick up in the posted procedures with taking the saved gmapsupp.img file, renaming it to gmapbmap.img, backing up to gmapbmap.img file on the Edge 520, and then replacing that file with your new maps.

So I installed topo maps as well as the Course I wanted to ride onto my Edge 520. I have my Edge set up with a Garmin magnetless hub sensor on the rear wheel, a Bryton cadence sensor, and a Bryton HRM (both of these came with the Rider 310 and have worked very well).

This was the actual ride.

I was dead accurate with following the Course. Other folks on the ride had problems with not getting warnings of turns until they were in the middle of them. The Edge 520 pretty much gave me notice at least 500ft away and sometimes well over a mile ahead of time. Part of that variability, I think, was related to the way the route was created in RideWithGPS. The people having trouble with getting adequate warning had older Garmins, and I have to wonder about the settings they used for Courses. At any rate, the Edge 520 navigated the long Course like a champ.

I will be using this GPS on a century ride this coming weekend, also. For that ride, no digital maps will be available. Navigation will be done the old-fashioned way, with paint on the roads. The Edge 520 will serve duty recording, and I will also load area maps so I have a visual reference for the area.

I’ll post mountain biking results after I use this GPS on a few mountain bike rides. I might well do a short and easy recovery ride tomorrow to stretch the legs out.


After a few mtb rides, I’m pretty pleased with how this Garmin performs in wooded, twisty trails.

I started with this short ride on a popular local trail:

Followed by this one:

and this one:

Quality improvements are subtle, to be completely honest. ┬áBut comparing to previous tracks that used different receivers, the differences become apparent. Here’s a rough comparison of my three main devices on the same trail. Different days, so it’s hardly scientific.


Click the thumbnail to expand. The yellow track is the Garmin Forerunner 310XT. Compared to the other tracks, it’s messy. It’s all over the place. Now look at the red and blue tracks. Those are a little closer together. The red one is the Bryton Rider 310. It’s not bad for a budget receiver. Pretty close together on the uphill and downhill legs of the trail. Much less erratic. The blue one is the Garmin Edge 520. It’s just a touch tighter than the Bryton. More importantly, I think, is the smoothness of the track. The Edge 520 track is super smooth, and I think better reflects the smooth and flowy nature of the trail.

I think the Bryton could be a fantastic receiver for the price if Bryton could address some of the quirks and oddities it has. Namely, the odd auto-lap screen that reports the same distance all the time, the ability to more quickly change bike profiles, whatever it is that causes Strava to ignore all wheel sensor data, and whatever it is that causes RideWithGPS to completely screw up all distance measurements from the device altogether. I am tempted to do a factory reset on the Bryton to see what happens with it then.

As it is now, I’m super pleased with the Edge 520. Strava doesn’t throw out wheel sensor measurements, thank goodness. RideWithGPS reports distances correctly. Switching ride profiles is super quick and easy. I’ve only used the Bluetooth connectivity once to set up weather alerts. None came through while I was out on the road, but nothing made me think I should have received one that didn’t arrive. I tend to leave Bluetooth off otherwise, because I don’t tend to use the features it offers and I like having some extra battery life. I’m also pleased that Garmin returned to physical buttons for this device. A few functions require more button pushes than a touch screen would, but I’m far less likely to mistakenly press a button than to mistakenly activate the touch screen.

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