Garmin - Forerunner 645 Music GPS Watch

Category: GPS Systems

I am on my 2nd of these watches. I had the first for about a week and was having many issues and returned it thinking it was a lemon. I have been using a brand new pair of Plantronic backbeat fit wireless headphones with it - the headphones work GREAT with my phone so I know the headphones aren't the problem. These are on the list Garmin says is compatible with this watch. I am also wearing my watch on my right hand as suggested with these headphones. I have also tried an older version of the plantronics for testing and a $20 knock off wireless version.

This is the first Garmin watch I can wear all day with comfort.

I was so excited about the prospect of ditching my ipod and headphones and moving to wireless headphones with this watch. Unfortunately, this watch has been a total disappointment in that regard. It loses connection to my headphone during my run and in the process, shuts off my watch. I had my watch shut down twice during the Boston Marathon....really frustrating. Now it won't connect to my headphones at all. The other features on the watch are great but the music feature clearly has too many bugs to have been released to market. Save yourself the frustration and buy the 645 without music.

I upgraded from the Vivoactive HR to this watch specifically for the music. I was tired of carrying my phone during a run. What I discovered is that the Forerunner provides much more fitness functionality than the Vivoactive HR. A significant upgrade focused on improving the users fitness level along with providing recommended recovery time. Increased functionality along with music is a winner for me. The only downside is the battery needs to be recharged every couple days if you use GPS and music daily.

I've had the watch for a few months now. Originally, I had no issues. Many reviews talked about connectivity concerns with blue tooth. I haven't experienced any of that. Unfortunately, what I did experience is that my watch face completely blanked out on me. It started by just fading - in that if i turned it the right angle I could tell there were numbers still. After that, I was able to turn the GPS on, and the screen came on, but it had lines all across it and was illegible. (kind of like old TVs get). Now.... it's the black screen of death. No buttons work. I've plugged it into my computer and the wall, nothing (it was fully charged when this issue started... and it all happened within approx 5 hours).

I really want to love this watch. I had no issues uploading my itunes music. And no issues my first few runs. Now, every time I run, the watch crashes during the first connection. It seems like the order in which you connect your headphones / GPS may make a difference? If I connect and play my music first, it crashes. I literally get the blue screen of death on my watch (OS/memory gibberish). If I connect the GPS first, and then headphones, I get the triangle of death. I’ve always managed to get the music and gps going after the first crash, and it seems to work for the duration of my run. But for this kind of money? Seriously? Also, after running I have a difficult time connecting it back to my iphone. I’ll be sending it back to REI for a replacement in hopes of better luck. But with all the negative reviews, I’m not holding my breath.

I love this watch. It is light weight, syncs perfectly with my phone, and I can listen to music on my runs without carrying my phone with me.

I bought this watch for GPS tracking whilst kayaking, and for music and running metrics. I should first say that I have had no trouble with GPS or Bluetooth connectivity whatsoever. My biggest issue is that the watch requires a software update at least twice a week. That requires my to plug my watch into my computer and sync it more often than is even necessary to charge the battery. If I don't get around to it before a workout, the watch is basically useless, telling me "Content Expired – Update your downloads to continue offline use." The software is supposed to update automatically when connected to wifi, but I have yet to see this happen even though I have automatic updates enabled. Additionally, even though I am doing the process manually, this process is only supposed to occur once every 30 days. I just synced manually on Saturday, went out for a run today, and was met with the error message. I had to complete my run without any fitness tracking or music.

Works for what I wanted. A little picky on the earbuds that work, apparently a weak signal from the watch, but plenty of great headphones work. Works for what I wanted

I switched from an Apple watch to this and it is worlds better. It is practically a smaller Fenix, missing only a few activity profiles and a longer battery life. The music controls are great, and very simple, though I have experienced many problems with cut-outs. However, this device is extremely versitile, and works more like a Fenix than a forerunner. It has numerous advanced training metrics that are extremely useful, including training effect (both aerobic and anaerobic), accurate VO2 Max, and training status and load. The battery life is a bit lacking, however a recent software update seemed to improve the life by about another day.

I bought this watch 2 weeks ago and have experienced several connection/BT issues. At first, it showed connected but I received no texts/email notifications. Then, it would disconnect from BT and never re-connect even though my phone (iphone 8) was inches away. I am in the process of working with Garmin support and have done all restarts and device removal, re-add, etc they have recommended but still experience the same issues. Other than that, I love the watch and all of the features, but it is frustrating to have a device that I cannot rely upon to work properly. Also, I never could get garmin pay to load with my credit card. So, based on my experience I would definitely not recommend this product until Garmin gets the connectivity issue figured out. I may be returning this to Garmin or REI, depending upon whether Garmin comes up with a firmware fix soon.

I love this watch! I have had two different FitBit variations in the past and they were always missing something that i wished the tracked or tracked better. But this watch does everything i need. For reference, I'm a runner and backpacker who likes to track steps and activities when I'm doing my usual desk job. I'm extremely happy with the watch and have had no problems syncing IHeartRadio or personal workouts.

I was cautiously optimistic when I bought this watch, because the reviews on REI were not the best. I bought the watch to replace my 10-year-old Forerunner 405. My plan was to wear it ONLY for running activities. Once I put it on, I put my Samsung S3 smartwatch away. Here are the things I love about it:

Purchased about 9 months ago. Not a bad device when it works, which has been about 90 percent of the time. The other 10 percent involved persistent calls to Garmin for support, which takes up a lot of time on the phone as well as resets. Some of the functions do not work when travelling to other countries such as wifi connection as well as Spotify (which does work on my cell). Most recent problem involved the earbuds with connection issues while running. They'd connect but about 15 minutes later the connection ceased. Called support and they told me the brand/type I have is not approved even though they worked fine since the purchase of the watch. Absolutely no information on the box/instruction manual about what is approved, even the website only mentions "Here are some of the best earbuds and headphones for easy listening on your Garmin device" without reference to saying other brands won't work. Buyer beware!

This is my 5th Forerunner, starting with the original FR101, and it looks like it will become my favorite. I'll use it mainly for running, and as such it means I don't have to wear a HR strap or carry my MP3 player. Moreover, I've always had trouble with HR straps giving wild readings due to being under layers of staticy fabric and so far the wrist HRM works well enough.

This watch is amazing. Pairs perfectly with one set of my Bluetooth headset. Sound is great and I've had no issues with this watch. Easy to set up.

The best performance of the watch is extremely fast. The resolution of the watch is much better than previous model I had and can even read it.

I was a little nervous about buying the music version of this watch given all of the negative reviews, but figured I could always try it for a few days and exchange if I didn’t like it. I’m not sure what’s going on with everyone else but I have had zero problems with the music feature and am SO glad I got this version! Being able to listen to music or podcasts while out without my phone is a true gamechanger!! No fussing with an armband or carrying my phone around during a workout. Plus with the Garmin pay and ‘find your way back’ feature I feel comfortable leaving my house with nothing but the watch and headphones.

I’ve had the 645 Music for almost two months now and I still haven’t decided whether to like it or hate it. Today I’m leaning toward hating it.



Just recently rose gold was added as a new color option, but Garmin's other new color--slate--is still not listed.  Any updates?

​We expect to sell the slate color this summer 2018.


When will you offer in Slate color?

As of June 2018, we do not stock the slate color and do not know if we will be stocking it.


Will REI offer the new Slate bezel color?

​As of June 2018, we do not stock the color black with slate hardware. We do not anticipate this color in the near future. All available colors are on our website.


Can this watch be paired with the garmin chest strap?

Garmin has these heart rate monitors that will work with the Forerunner 645:


Can you also load podcasts on to this watch?

​You can load podcasts to this watch if the podcast is in the .mp3 or .aac format.


Will this watch support offline pandora music?

As of March 2018, this watch does not support offline Pandora listening.


Does this stream offline Spotify music?

​This watch cannot accommodate music from Spotify.


Does this watch last longer than 5 hours in gps mode while not listening to music?

With the device in watch mode with music, the estimated battery life is up to 8 hours. This is with GPS functionality completely turned off.


Can the watch track elevation gain on a treadmill and/or stepmill?

​This watch does not allow you to track elevation gains or losses while running on a treadmill.

Thomas B

What happened to the "Cerise" colour option?

​As of March 2018, the cerise color can be pre-ordered.


Is there any update on when these will be offered in stores?

​Please call us for the latest inventory and shipping information. We can be reached at: 1-800-426-4840.


When is the expected release date for in-stores for the 645? REI started advertising this watch some time ago. Usually when REI starts advertising a product it's released fairly soon after. This doesn't seem to be the case for the Garmin Forerunner 645

​Please contact us for the latest inventory and shipping information. We can be reached at: 1-800-426-4840.


Is the watch compatible with any wireless headphones or only with the Skull Candy ones?

​Most bluetooth headphones will work with the 645.


Do you have any updates on expected ship date? I know you can't guarantee the ship date, but has Garmin provided any estimates?

Please contact us directly at (800) 426-4840 for more information about backorders.


Probably too soon to know, but is this watch going to be compatible with spotify?

​There is not expected to be support for Spotify.


compare with other alike watches how long battery last

In Smartwatch mode, this watch has an estimated battery life of approximately 7 days. With GPS and music streaming turned on, the battery life is approximately 5 hours.


Does this watch allow for courses to be programmed(.gpx files)?

​You can download courses/routes from your computer or phone to this watch.


What are the watch dimensions?

​The face of this watch measures 42.5 x 42.5 x 13.5 mm. The watch band fits a wrist circumference of 5 to 8 inches.


Can one listen to Pandora or iHeart radio using this watch?

​This watch is compatible with iHeartRadio. It is not compatible with Pandora.


Does it have an in-built "Hike" app?

​No, there is not a built in hiking app. One can be added by either creating it from the 'Other' profile or adding it from Connect IQ.

Thomas B

Do you sell the version with the red band?  If not, why and/or when will you start to sell it?

We expect to stock the red wristband model. Please check back later in spring 2018 or give us a call at 1-800-426-4840 for the latest details.


What is the estimated ship date?

​Please contact us directly at (800) 426-4840 for more information about pre-orders.

Alex S

Do you plan to carry the 645 without music?

​As of January 2018, we hope to carry the non-music version. Please contact us at (800) 426-4840 for additional information on inventory.


Will you be carrying the non-music variant as well?

​As of January 2018, we hope to carry the non-music version. Please contact us at (800) 426-4840 for additional information on inventory.


What heart rate chest straps are compatible with the forerunner 645? Does the 645 have all of the bicycle training features as the forerunner 935?

​The 645 Music GPS Watch has some cycling features, but does not have advanced dynamics cycling features used for triathlon training in the 935. The 645 uses ANT and Bluetooth to connect to different types of chest straps to monitor heart rate.


Will you be selling the 645 with the cerise watch band?

​As of January 2018, we hope to carry the cerise color in the future. Please contact us at (800) 426-4840 for additional information.

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