REASONS TO BUY
Long battery life
Good button navigation
REASONS TO AVOID
Bulky and heavy
Expensive
Garmin GPSMAP 66i Review
If you want full handheld GPS functionality with your satellite communications, this is the product and service for you
Credit: Garmin
By Jediah Porter ⋅ Review Editor ⋅ January 19, 2023
RELATED: Best Satellite Communicators of 2025
Our Verdict
The Garmin GPSMAP 66i is two devices in one. It offers both full-function navigation and satellite communication attributes. One way to look at outdoor electronics is to consider four major uses. Most people use electronic devices in the backcountry to take pictures, communicate with cell signal, communicate with satellite, and navigate. Each can be done with a dedicated device, and each can also be done on a device that does at least one of the others. Your smartphone has cell signal, photos, and pretty good navigation function. Satellite signal (for the most part) requires a standalone device. At this point in history, dedicated wilderness travelers will carry at least two devices to accomplish the above four tasks. If the navigation attributes of your smartphone are not good enough, you can choose a standalone GPS device or mash together your navigation and satellite communications. In this lattermost (and albeit rare) case, the GPSMAP 66i is your best bet.
Editor's Note: We tested this device through the early winter of 2022-23. In writing this, we call on actual use of the GPSMAP and deep experience with similar predecessor products.
Our Analysis and Test Results
The Garmin GPSMAP 66i is both the biggest satellite communicator and the only product that combines full-function standalone satellite communication with full-function GPS navigation. Most are now navigating in the backcountry with their smartphones, but not all. If you want a full function GPS navigation device and sat comms in one device, choose the GPSMAP.
Complex wilderness navigation might justify a stand-alone GPS device. In that case, maybe the GPSMap 66i is the best choice for you.
Credit: Jediah Porter
SOS/Emergency Messaging
Garmin configures the GPSMAP 66i and its subscription/service to allow unlimited, well-supported emergency messaging. The Iridium network relays the message, and the “Garmin Response Team” works to get local resources to you and your emergency. In this way, it works the same as all other inReach products and is pretty similar to all the products in our test. The biggest differentiator in emergency messaging is whether you have SOS only or if you can conduct two-way messaging to further detail the nature of your emergency and learn of the response progress. The GPSMAP has two-way messaging.
The contents of the Garmin GPSMap 66i box. Brief instructions, charging cord, lanyard, and device itself.
Credit: Jediah Porter
Non-Emergency Messaging
You can send and receive customized messages (best to do so through the accompanying Garmin “Explore” smartphone app), configure the GPSMAP 66i to passively send tracking data to the outside world, and receive rudimentary weather forecasts. Finally, using a series of button commands, you can view, compose, and send text messages from the GPSMAP without your smartphone. All this together makes this device (along with all the currently sold inReach devices) as comprehensive as any satellite device gets for non-emergency messaging.
The satellite messaging attributes of the GPSMap 66i are familiar and comprehensive. Here, at the start of a big trip, we activate tracking so that loved ones at home can follow along.
Credit: Jediah Porter
Signal Coverage
The GPSMAP 66i uses the Iridium global satellite network to send and receive your satellite messages. The Iridium network is the best private-sector satellite network for truly global coverage. That said, all satellite communications are vulnerable to local terrain matters. Messages take time to send and receive, especially in dense forests and/or in and near steep terrain. In the most extreme terrain, you might not get a message out or in. This is the same for all satellite products and networks.
To optimize the function of the GPSMap, pair it with one of Garmin's two compatible apps. “Explore” has mapping features, while “Messenger” allows for seamless texting across data sources.
Credit: Jediah Porter
Ease of Use
This is a technical piece of equipment — you will need to arrange an app and a subscription, as well as learn how to navigate the buttons on the device itself. All the devices we tested are similar in this way. As compared to the others, Garmin's products aren't the most user-friendly. The end result is great, but the initial learning curve is a little steeper than the newer, more tech-savvy companies making similar products.
Backcountry skiing is a pursuit heavy on off-trail navigation needs. The GPSMap 66i is a contender when you want to have robust navigation attributes with your satellite communication device.
Credit: Jediah Porter
Portability
The GPSMAP 66i is the largest and heaviest product in our test, but it also does more than the others. It has a large screen, long battery life, and full navigation functionality. If you navigate with your smartphone, the extra bulk is unnecessary and undesirable. If you would carry a standalone, hand-held GPS device anyway, the bulk and weight of the GPSMAP 66i won't be as much of an issue.
Weight matters a lot in steep, serious terrain. The bulk and mass of the GPSMap 66i isn't the sort of device, at this time in history, that mountaineers are choosing for their trips.
Credit: Jediah Porter
Should You Buy the Garmin GPSMAP 66i?
If you know that you need a standalone, purpose-built, hand-held GPS navigation device and also want satellite communication capability, the GPSMAP 66i is your best choice. The catch is that, in the age of excellent smartphone wilderness navigation, the need and desire for a hand-held GPS navigation device is virtually none. But if your use cases match the feature set of this device, it may be the one to choose.
Setup and optimal use of your GPSMap 66i will require some tech savviness and at least a few minutes of configuration and familiarization.
Credit: Jediah Porter
What Other Satellite Messengers Should You Consider?
High-end practitioners are choosing to navigate with a dedicated wilderness navigation app on their smartphone (Gaia, Caltopo, and OnX are three examples) and perform their satellite communications with a smaller device like the Garmin inReach Messenger, ACR Bivy Stick, Zoleo Satellite Communicator, or Somewear Global Hotspot. That said, if you know you want to combine your satellite communications and navigation device into one product, then the Garmin GPSMAP 66i is the best thing on the market.
Side-by-Side Comparison
Compare Garmin GPSMAP 66i versus top competing products:
—Jediah Porter
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