Summary: I used it for just a few months and found the message:" the map cannot be authenticated." I looked online for help and found nothing. Log in Garmin website and register the product also would not help. What I found is that many users had similar problems and no clue to solve them.
Bikers are stuck with Garmin for navigation. Buy something else if it exists!
Toddler Mom, Amazon
26 July 2014
Summary: I have had this Garmin 800 for one year now. Unfortunately, there are no competitors to Garmin. Phone navigation systems don't have enough battery life compared to the Garmin. It is also annoying to carry a spare battery to hook to the cellphone due to extra wires hanging on the bike.
Summary: I bought one of these devices as soon as they came out; I was unable to get it from Amazon so I bought it from another supplier. I wanted to have a way to lay out rides for my bike club and have the turns pointed out as I rode to stay on route on unfamiliar roads.
Summary: I replaced my flawless Garmin 500 with the expensive bells and whistles 800. A big mistake. As reported by numerous owners, mine randomly would not connect to my computer for uploads, and of late doesn't connect at all.
Has no stability and malfunctions despite software/firmware updates as well as repeatedly sending back to the factory.
NORMAN A LINDER, MD, Amazon
7 June 2013
Summary: I have been using the Garmin edge 800 unit with appalling stability and functionality. It seems it only takes a few rides until my cadence sensor fails, my cardiacs soft strap monitor fails, and, ultimately, the auto start/stop function goes crazy as if it were possessed (even when I manually shut...
Summary: After 1 ride the Garmin Edge 800 has proven the most frustrating cycling accessory known to me. The setup was fine, if not that intuitive. I was able to use open source maps rather than spring for the expensive Garmin maps. I appreciate that feature.
Summary: Of all the gadgets and software I have ever owned, I believe my Garmin 800 is the leader as the most aggravating time sink and biggest disappointment. This is especially unfortunate, because the hardware and technology are all there, it just hasn't been put into a complete package that met my needs.
Summary: The unit will accurately track your ride but the speed/cadence sensor is unreliable. I have replaced the sensor twice with negative results. I am now going to remove it altogether and rely on the GPS features alone.
Summary: The user interface is unbelievably bad. Really, really bad. Not just hard to use, but very bad. Menu options are categorized poorly and in the wrong place. Forget touching something to change it, everything is controlled by a on screen arrow or dedicated menu screen.
Summary: I received the 800 in December 2010 and I loved all the features and performance. In June of 2011 the unit no longer allowed me to upload my rides. As a result I had a number of back and forth emails with Garmin Customer Support and finally had to send it back so it could be exchanged.