August 2, 2025

Garmin 66i is busted!

I bought this back in June of 2021, paying $450 for it. I bought it new are REI during their anniversary sale.
It worked for 4 years.

Today I was at the trailhead, pulled it out of my pack, held down the power button. No response. I tried several times, scratched my head thinking that I was sure I had charged it, but I must be wrong and the battery must be dead.

I got home and connected the charging cable I always use. No response. The unit won't power up with a cable connected and several tries holding down the power button. I try a different cable and power source with no better results.

I check on the warranty. It has a 1 year warranty. I need to call Garmin support and see if they can help me.

So --- after writing all this I decide to plug in the cable again, figuring I would let it "charge" overnight and hope for the best. But as soon as I plug the cable in, the garmin logo appears on the screen and in a few seconds it fires up! I pull the cable and tell it to shut down. Now I use the power button and it starts up just like normal. It shows the battery at about 90 percent.

I don't know what to say. I would be tempted to think the power button/switch is getting flakey, but it refused to fire up when I plugged the cable in like it should have.

Second incident 8-13-2025

It turned on just fine at the traithead and ran for the first hour. Then I looked at it about 2 hours into the hike and the screen was off. Restarting it with the power button did not work. I got home and plugged it into USB and it fired right up. Battery looks like 80 percent charge or more.

Third incident 8-19-2025

It powered up at the trailhead. I carried a power bank so I could see if plugging it into the power bank would revive it if it dies. Sure enough, I stopped for a break and when I picked up my pack with the unit attached, it turned off. Interestingly, I watched the screen go grey then slowly fade to blank. I tried various button pushes, then used the power bank and then it fired up and worked for the next two hours, then again I bumped it and watched it fade out.

The fading out on a bump is new information. I suspect the unit is running, but the screen is the issue. Quite possibly me trying button pushes ends up turning it off. But I really don't know what is going on. The main thing is I am 3 out of 3 for taking it on hikes and having it fail me.

A replacment unit

I get on Ebay, bid on a unit and win the bid for $255. These still sell (on Amazon) for $600 new. The newer 67i sells for the same price. The 67i has a USB-C connector and claims longer battery life.

The cost including $11 for shipping and $16 for tax comes to $281.
The seller description is:

This unit is approximately three years old and rarely used.
No scratches and includes an attachment clip and flotation ring.
It's on the way. I still may talk to Garmin about having my original unit repaired.

It arrived

Friday 8-22-2025. I power it on and it says "New software found, continue installation?" I say yes, select English, and it offers activation. I select "Skip" for now. It remembers a location in southern Idaho (which makes sense).

The unit looks absolutely perfect, new, and unused. The battery is about 50 percent charged. I plug it into a charger and that will do for a first checkout.


Have any comments? Questions? Drop me a line!

Tom's backpacking pages / tom@mmto.org