For many years Garmin were the king of the cycle computer market. However, a couple of years ago Wahoo produced the Elemnt, which is a serious challenger. I have had a Garmin 810 for about three years.

I have generally been happy with it, but it does have several annoyances. If
you upload a route to the Garmin with turn by turn data for long routes it has a tendency to crash after about 60 miles, often losing your rides data. Sometimes if you are
following a pre-planned route using its sat nav, you will suddenly be told that
you are off route in the middle of a two mile section of completely straight
road and told to do a "U" turn. It does this even through the blue track on the
screen shows you are on the correct route and don't need to turn round. All the setup on the Garmin is via on screen menus, some of which are deeply
nested. Thus doing something simple like changing the unit to display Imperial rather than metric units requires a fifteen-minute trawl through the various
menu options.

In contrast, the Elemnt relies completely on its smartphone app for setup and
configuration. Initial setup is very simple: turn the unit on and scan the QR
code using the Wahoo app. You can configure which fields are shown on the unit and their order on the Elemnt's screen by dragging and dropping them in the app. Unlike the Garmin the Elemnt can use both WiFi and Bluetooth. If you have an Ant+ sensor, e.g. heart rate (HRM), you can easily pair this to the unit using the app. Ant+ is a bluetooth protocol that lets you connect multiple devices to a single sensor, so you could connect your HRM to the Elemnt and a smart watch at the same time.

Development of the Elemnt has been rapid with new features (e,g. turn by turn
navigation) in both firmware and software arriving frequently. You can download pre-planned routes from the various supported services (e.g. Strava and Ride with GPS) onto the device. At the end of a ride your data is automatically uploaded to all of the connected services. The screen is larger than the equivalent Garmin, so is easier to read for oldies like me, with less than perfect eye sight. If you live in a hilly area, you can get the Elemnt to
display the gradient profile on screen, showing your position, so you know how much suffering is in front of you.

Battery life is slightly better than the Garmin: 17hrs claimed. Connection for
recharging the battery is via micro usb, whereas the Garmin uses mini
usb. Unlike the Garmin the Elemnt comes with a complete set of world maps. I have only been able to test UK maps, but they seem to have all the small
country lanes and tracks in my very rural area.

My only real niggle with the Elemnt is the buttons used to control some
features of the unit, which are quite stiff and hard to press when wearing
gloves. However, most of the time I only need to press the Start button at the
beginning of the ride and Stop at the end.
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