The Forerunner 405CX is the evolution of GPS-enabled training. This sleek sport watch tracks your distance, pace and heart rate, then wirelessly sends the data to your PC for later analysis. The 405CX features heart rate-based calorie computation and comes with a second wrist band option suitable for smaller wrists.

Loaded with serious training features, Forerunner 405CX continuously records your time, distance, pace, calories burned and heart rate. Each workout is stored in memory so you can review and analyze the data to see how you've improved. And advanced training features will challenge you to step up your pace--race against Forerunner's Virtual Partner to improve your times, or set up interval workouts without having to circle the track. You can even download recorded courses to compete against previous workouts. To use the watch, simply tap the touch bezel to change screens without fumbling for a button.

Track Heart Rate
Forerunner 405CX comes with a flexible, wireless heart rate monitor to help you make the most out of your training. The digital heart rate monitor continuously tracks heart beats per minute and uses your heart rate for advanced calorie computation, so you know how many calories you're burning. Train in a certain heart rate zone to improve your fitness level or compare your pace and heart rate to past performance on the same run.

Share Workouts Wirelessly
With Forerunner 405CX, you can share your locations, advanced workouts and courses wirelessly with other Forerunner 405 users. Send your favorite workout to your friends to try, or compete against someone else's recorded course. Sharing data is easy: just select "transfer" to send your information to a nearby device.

Run, Sync, Store and Share
Once you've logged the miles, innovative ANT+ wireless technology automatically transfers data to your computer when Forerunner is in range. No cables, no hookups. The data's just there, ready for you to analyze, categorize and share through our online community, Garmin Connect or our optional Garmin Training Center software. You can even plan workouts on your computer and then send them to your Forerunner.

Train Year Round
Take your training inside with the versatile Forerunner 405CX and optional wireless accessories. Pair it with an optional foot pod to track your speed, distance and running cadence indoors when GPS signals are unavailable. The wireless foot pod clips onto your laces for easy removal and automatically turns on when you start moving. Or pair your Forerunner with an optional speed/cadence bike sensor to track the speed and distance of your cycling workouts.

What's in the Box
Forerunner 405CX, USB ANT stick, Heart rate monitor, Two additional wrist straps, AC charger, Charging clip, Owner's manual on disk, Quick reference guide

By 

After using the Forerunner 305 for over two years, I decided to replace it with the 405cx and am very happy with my decision. But first let me address the main criticism of the 405cx and its predecessor the 405--the bevel and touch system.

Garmin is not Apple, so the bevel and touch are not on par with the scroll wheel on an Ipod or the touch on an iPod Touch--but they still work fine. Granted, if the bevel gets sweaty or I touch it with sweaty fingers (not something unexpected for an exercise watch) it becomes nonresponsive until I wipe off the sweat. But this is not a big deal for me. When I run I simply use auto scroll, which is unaffected by moisture. And if I want to override auto scroll by using a manual touch, it takes only a second to wipe the sweat off the bezel or my fingers. So don't be discouraged from buying this unit based on the bevel and touch.

While the 305 is a great unit, here is why I like the 405cx better. Note: I use this on an Intel powered Macbook running the latest edition of Leopard without any problems.

1. Although the 405cx is as thick as the 305, it is noticeably smaller and lighter.

2. I like the wireless ANT technology that automatically transfers data rather than having to place the unit in a USB cradle as with the 305 (though doing so is not a big deal), and also effortlessly pairs with my heart rate monitor and foot pod (which must be purchased separately).

3. The 305 has no power save mode, and I inadvertently drained the battery a couple of times when I forgot to turn it off after running or put it in the charger. The 405cx not only has an automatic power save mode, but you can turn off the GPS when running indoors to further save power. With the GPS turned off, barely any power is used. Also, this ability to turn the GPS off makes it easier to use the footpod when running indoors (the 305 first has to search for a satellite signal before realizing you are indoors, and that can take several minutes).

4. I find the bevel and touch system on the 405cx much easier to use than the buttons on the 305 in order to change various features. But I like electronic gadgets, and as I said above, the sweat issue is not a big deal for me.

Here are some tips:

1. Rinse the unit, the heart rate monitor and the strap after each use with plain water.

2. Keep the unit in the charging clip after each use to ensure you always have enough power. A simple touch of the bevel will tell you the percentage of power left. The charging clip can be powered via a USB port on your computer or via an electric outlet using an AC adaptor. The included AC adaptor with the 405cx is very clunky; I use the Apple travel charger for the iPod instead. Make sure the charging clip is properly attached to the unit or you will drain the unit instead of charging it (already happened to me).


3. Although the unit lists three training fields, there are actually four if you have the heart rate monitor--by default only the heart rate shows up in the first field, but you can modify that to include two additional data items.

4. Unlike the 305, where you can move forward and backward between data fields, the 405cx lets you move only forward. Therefore, when I run indoors I turn off my "outdoor only" data fields--grade, elevation, etc.--so that I don't waste time looking at them.

5. For a first time purchaser to whom cost is important, I would say get the 305. My reasons for switching to the 305 may not be important to you.

6. Buy the new version of the footpod rather than the old version (I have reviewed both on Amazon) for running indoors.

7. I use a Mac software program called Ascent that I think is far superior to Garmin Connect and Garmin Training Center, and unlike the former does not require an internet connection to upload data.

Bottom Line: I have had this unit for three weeks and run over 100 miles both indoors on a treadmill and outdoors in all kinds of weather--light rain, cool nights, and hot humid days. I really like this unit. Due to the bevel and touch issues I would have rated it 4 ½ stars if I could, but since there are no ½ star ratings I gave it 5 stars despite those issues because for me they are negligible compared to the rich features on the 405cx. If you are a serious runner, you will love this unit.

Update July 22, 2009: I have now been using this for about six weeks and logged over 200 miles. In that time I have had the bevel lock up due to sweat only twice: once in the gym and once outside. The point is that this is even less of a problem than I thought, and should not discourage you from buying this unit.

A more serious issue is with the ANT technology. Sometimes I will get a message on my laptop that the transfer of data to the laptop from the 405cx was not successful. I then quit the Garmin Ant Agent on my laptop (and sometimes remove and reinsert the ANT USB stick as well), restart it, and have to go through this process three or four times before the data finally transfers to my laptop. The problem began after I updated the ANT software, and I see from Garmin forums that other users have experienced the same problem. Hopefully this is just a bug that Garmin will fix in a later update. While I would not let this discourage you from buying the 405cx, just keep in mind that a wireless transfer of data, while convenient, is not always problem free.

Update August 21, 2009: Garmin released an update for Macs (and I assume for PCs as well) that solved the download problems using the ANT technology. Now the data transfers work perfectly.

The more I use this watch, the better I like it. Here are my latest comments:

1. The backlight is far superior to that on the Forerunner 305. It produces a much brighter light that I appreciate when running at night either outdoors or on the treadmill at my gym (the treadmill area is kind of dim at night).

2. The battery life is excellent. Even with BOTH the backlight AND the GPS on for a couple of hours, battery capacity is still 75% when I am finished running. What this means as a practical matter is that if you forget to hook this watch up to the charger after a long run, you will still be good to go for your next run. The battery life per charge on the Forerunner 305 is not as good, and sometimes when I forgot to charge the 305 between runs, the battery would die during the second run.

3. The "sweat issue"--i.e. the watch becoming non-responsive when the bevel gets sweaty--has become a non-issue for me since I haven't experienced any problem in months. Perhaps that is because I periodically "towel off" the sweat on my wrist and forearm during a long run.

Update January 9, 2010: I continue to recommend this watch as the best GPS watch for serious runners. Using it this winter has been a pleasure. Here is why:

1. I have run in sub-freezing temperatures where the "real feel" with the wind has been as cold as zero. I keep this watch around the outside sleeve of my running jacket so the GPS function is not impeded (as it would be if the watch was covered up). The bitter cold has had no adverse effect of any kind so far.

2. When I take a break during my run at a local convenience store, the watch does not fog up when I go inside, and after I have warmed up, it does not fog up when I go back outside.

3. I have run in light snow, which I just shake off the watch periodically without any adverse effect (and I did not expect any, since I have run in light rain during warmer weather without any problems).

In short, this watch is performing great during a very cold winter in the Northeast.

Update May 24, 2010: I have been using this for almost a year, and it still works great. On a recent vacation to Mexico, the satellite signal was picked up quickly and without any problem, and the same was true when I returned home to New Jersey. Also, I ran outdoors in very hot and humid weather, and was drenched with sweat. It just took a couple of seconds to wipe it off the unit so that it would function properly. Here is a cleaning tip: At the end of each run I stop the timer, then touch the Time/Date at the top of the unit to switch to the time, and then lock the bezel before I rinse the watch off. I found that if I tried to lock the bezel while the unit was still on the exercise screen, sometimes I would accidentally restart the timer. But that doesn't happen if you switch to the Time/Date before locking the bezel.

By 

Gadget Geek (Schaumburg, IL)

I'm a new runner and after running the Shamrock Shuffle in Chicago this year, I think I'm addicted. I even registered for the 2009 Chicago Marathon, I still can't contemplate running a full 26.2 miles. But if I'm gonna do this, I'm gonna do this right. Running on nearby trails, I never really knew how far I've run or what my pace was (there aren't any mile markers). I wanted a way to track my distance and pace. I have friends that own both the forerunner 305 and 405, and I was impressed on how accurately they tracked distance and pace. I researched the reviews on both, and even though I like the looks of the 405, I was leaning toward the 305 since it's half the price and the reviews were much more positive. However, I couldn't get over the notion of looking like I'm running with a computer on my wrist.

Along came announcements of the 310xt and 405cx. Initially, I was set on getting the 310xt because of it's large screen and waterproof capability. However, it wouldn't be released till mid May and that model wouldn't even include the HRM. Originally I thought the 405cx wasn't available until mid May also, according to Amazon's 405cx preorder. But to my surprise, I found it available for free overnight shipping from the Clever Training website for 369.99. I got mine for 314.95 with free ground shipping, so do your research and you might land a "premium" deal on this heart rate monitors in USA ;-)

I'm getting side tracked here, I decided on the 405cx because I was hoping Garmin would have ironed out all the flaws of it's previous iteration. I've never owned the 405 or 305, so I can't say how much better the 405cx is. After reading the 405 reviews, a few complaints caught my attention:

- Poor satellite reception
- Clumsy bezel interface
- Locks up when sweated on
- Inaccurate heart rate monitor

1. Satellite reception is excellent. It's able to track satellites indoors! (though accuracy is degraded)
2. The bezel interface, although very sexy, is a pain in my arse to use. It's overly sensitive at times and not in others. Lock it often. It's going to take some time for me to get use to. Oh well, it's the price I have to pay for sexiness...
3. In the 2 days I've had this unit, it's never locked up on me. I want you to know, I sweat profusely to the point where it looks like I just took a shower (I wish I was exaggerating, but I'm not...). I don't just sweat when I'm working out either, sometimes I sweat sitting idly in a chilly room. It's so embarrassing during meetings! So trust me, sweating does not cause the 405cx to lock up.
4. The heart rate monitor is superb. This is my first HRM though, so maybe I don't know what I'm talking about. But it doesn't spike to 200 bpm or drop to 20 bpm like the treadmills in the gym do, so I'm happy. On a side note, the 305 loves the HRM that comes with the 405cx. The one that comes with the 305 is utter garbage, it stays at 65 bpm regardless of what you do. It was probably defective, but it's something to think about for anyone thinking of getting the 305 instead.

This review is getting really long, and I need to get back to work. Garmin Connect is the online software that manages all your running data. Use it, it's hot. Just be aware, at default all your activities are shared with the Garmin Connect online community (think of what you put on your descriptions). I love how you can "play" your run on Google maps. It's hard for me to explain, check out this link for yourself