My decision is to keep it. The Pros and Cons are as follows:
Another point of confusion was a sticker on the box that said "made for iPhone/iPod". This is entirely misleading (and probably Apple pays Garmin to put it on there). There are not separate iPhone versus android versions of the 66i as this label might suggest. The necessary apps are available for android as well as iphone, so this label can be safely ignored by android users like myself.
I have lots of other notes on my decision elsewhere. It does boil down to your own priorities and budget. The following reviews are excellent. The REI review is succint and very good. The Hiker Guy review is much longer, but very much worth watching more than once.
It can store 10000 waypoints, 250 routes (250 points per route), 250 tracks, with 20000 logged points, 250 saved gpx tracks and 300 saved fit activities. The Garmin 66i was released in June of 2019. So I am buying it 2 years after the release and some of the bugs I have read about have been fixed.
Compare this to my ancient Samsung S4 phone that I have been using as a GPS. The S4 has a 1080 by 1920 pixel screen (1080p), 2.5 by 4.5 inches by my measurement. That is about 4.5 times as many pixels measured in either direction, and about 20 times as many pixels overall.
In other words, using the 66i will be like looking through a knothole compared to my phone.
The "page" button cycles through various major screens and is quite handy. What is even more handy about it (and somewhat surprising) is when you see the screen you want, you just stop and wait a couple of seconds and it switches to that screen. No need to push enter.
To set a waypoint, there is a dedicated "mark" button -- I spent 5 minutes looking through menus trying to discover how to set a waypoint. Also if the map is not centered at your current location, they waypoint will be set wherever the map is centered.
The find button has sent me on a variety of wild goose chases. I get the message, "This route may take a long time to calculate, consider adding via points". I wonder what the heck is going on (it is trying to generate turn by turn directions to get me somewhere apparently). You can cancel this by selecting "FIND" and then selecting "STOP Navigation" in the menu that appears. You can get into this same darned navigation mode by doing other things, like hitting "Go" when you are looking at a way point.
So, if I have moved on the map away from the current location, how do I get it to center the map again on my present position? They call this "pan mode" and there should be a white panning pointer along with a "dashboard" showing the distance and bearing from where you actually are to the point you have panned to. Just type "quit" to cancel all this and get back to the "normal" view with your current location at the center.
The device seems hell bent on starting to record activity. I go to Setup, Recording, and turn off "Auto Start". I also have to go to Recording Controls, stop and delete the current activity because of course it is busy recording by default.
To delete a recorded activity, find and select it (go to it so you see all the summary data) then hit menu and delete will be one of the options.
There is a "secret" feature. If the device is on and you briefly press the power button you will get (for a short while) a display that shows backlight level and battery life. It also has a "lock keys" option, and indicates if Wifi and blue tooth are on. With other units (like the 64) this was the only way to check battery status, but the 66i nicely shows battery status in the top left of the map screen.
Tom's backpacking pages / tom@mmto.org