Garmin GPSMAP 66ST 5064-384

Garmin GPSMAP 66ST

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Show Description

Wander, without being lost. With access to 3 different satellite networks, topographical maps and satellite imagery, the GPSMAP 66ST lets you explore with confidence. Preloaded with TOPO maps for Canada and the US, it makes backcountry navigation and trip-planning simple. The powerful antenna connects 3 different satellite constellations: GPS, GLONASS and Galileo. Multiple networks, combined with satellite position caching, give you a fast connection and a strong GPS signal wherever you are. The free Garmin Explore™ service lets you plan your trip on your computer or phone: just download the map data you need and plan your journey on your preferred device. Once you're ready to start your adventure, send your planned routes and tracks right to your 66ST, no cell network required, and it won’t cost you a thing. Pair your 66ST with the free Garmin Connect™ app on your smartphone to review activities, set up live tracking sessions, monitor real-time weather forecasting, review satellite imagery, receive notifications, control apps and more.

  • Preloaded with Canadian and US topographical maps (100K resolution) so you can get the lay of the land and plan the most efficient routes.
  • Includes access to BirdsEye Satellite Imagery, where you can download satellite images (no subscription required).
  • LiveTrack™ during activities (through a connected smartphone) to share your location, speed and more with friends, family or followers.
  • GroupTrack displays the location and telemetry of up to 50 contacts who use compatible Garmin devices.
  • Active weather provides real-time radar tracking (via a connected smartphone running Garmin Connect), allowing you to stay one step ahead of bad weather.
  • Free Garmin Connect mobile app allows you to customize your 66ST experience, choosing which widgets to show and when, reviewing stored activity data, selecting which apps can push notifications, loading and syncing geocaching data and much more.
  • Connect IQ support allows you to download apps, templates, data fields and other features.
  • Bluetooth Smart and ANT+ compatibility lets you explore smarter with compatible activity sensors and accessories.
  • Send smartphone notifications straight to your 66ST via the Bluetooth connection to your paired smartphone.
  • Compatible with all smartphones featuring Bluetooth 4.0.
  • Garmin Explore™ website and app let you sync routes, tracks and waypoints to your device. You can download map data to your phone, use your phone to plan routes and tracks, and then send those plans to your 66ST, all without cell reception.
  • Connects to GPS, GLONASS and Galileo satellite constellations for fast signal acquisition and a strong connection nearly anywhere.
  • Satellite caching allows your 66ST to save an extended predicted orbit path (EPO) file so it knows where to look for satellites when you turn it on.
  • Barometric altimeter helps you track your ascents, descents and total elevation changes.
  • Tilt-compensated 3-axis electronic compass shows your heading even when you're stationary, so you're always facing the right direction.
  • Extended battery life, with multiple different GPS modes let you find the perfect balance of battery life and GPS accuracy.
  • Large 3in. screen is bright and clear, making it easy to read in all conditions, even direct sun.
  • 16GB of internal memory can be increased via MicroSD cards (not included).
  • Ergonomic design can be easily used with 1 hand in any weather, with or without gloves.
  • IPX7 waterproofing protects your 66ST from even the heaviest downpours.
  • Built-in LED flashlight helps you get back safe if you get caught out after dark, and there's even an S.O.S. mode should things take turn for the worse.
  • In the box: GPSMAP 66ST preloaded with 100K TOPO Canada and US maps, BirdsEye satellite imagery access (no subscription required), USB cable, carabiner clip and documentation.

Tech specs

Show Tech specs
Weight 230g
Ideal for
  • Backpacking
  • Winter and expedition camping
  • Alpine climbing and mountaineering
  • Backcountry skiing
Display dimensions 6.3 x 3.8cm
IPX rating

Indicates the degree of protection against liquid. IP X1: Dripping water while in normal operating orientation; IP X4: Splashing water; IP X5: Water jets; IP X6: Powerful water jets; IP X7: Immersion up to 1m ≤ 30 minutes; IP X8: Suitable for submersion as specified by manufacturer.

Built-in memory 16GB
Dimensions 16.3 x 6.2 x 3.5cm
Snooze No
Countdown timer Yes
Stopwatch Yes
Electronic compass

An electronic compass allows the user to view their heading in situations where they are either standing still or moving too slowly for the GPS to detect.

  • USB
  • NMEA 0183
Low battery warning Yes
Calorie consumption

Calculated based on data from a heart rate monitor.

App compatibility

An online community where members upload, analyze and share activity data.

Garmin Connect
Add maps capability

These units allow you to add maps, so you can mark and name waypoints and create routes on your PC, and then upload the map of your choice to your GPS.

Programmable workouts

Want an easy jog? A fast-paced ride? A workout with lots of variety to keep you on your toes? With programmable workouts you can tailor your training to match whatever you are looking for on a particular day.

New lap auto start

Automatically triggers a new lap after reaching a specified difference.

Heart rate monitor Sold separately
Distance/time alarm Yes
Floats No
Interval training Yes
Bluetooth Yes
Auto pause

Automatically pauses timer when you stop or go below a specified pace.

Heart rate in real time

Displays beats per minute during activity.

Calories in real time

Displays calorie expenditure during activity, based on heart rate monitor data.

Speed/cadence sensor

Monitors pedalling cadence and measures pedalling strokes per minute.

Sold separately
Battery life 16-168 h
Chest strap Sold separately
Custom POI

A POI (point of interest) is a specific location that someone may find interesting (i.e., favourite viewpoint, best coffee stop before the trailhead). The custom POI feature allows the user to load only the POI's that interest them onto their GPS unit.


Waypoints consist of a standard set of coordinates (two for land, three for air or space) that identify a specific physical location. A route is navigated between two or more waypoints.

Metric/imperial units format Yes
Power meter

Displays output in watts as you ride.

Not compatible
Unit to unit transfer

Shares data wirelessly between compatible units.


A basic set of map data that is included with the GPS. Basemap detail may vary from unit to unit.

Area calculation Yes
Track log 20,000 points, 250 saved tracks
Tide tables No
Battery power indicator Yes
Data card microSD card (not included)
Foot pod

Attaches to your shoe, captures your running data (i.e., pace, distance), and transmits it to your heart rate monitor or GPS.

Sold separately
Touch screen No
Heart rate target zones

Displays heart rate zones during activity.

Barometric altimeter

Barometer function helps forecast weather trends. An altimeter can provide one line of position for location on a topo map, useful if the GPS isn't working.

Coded signal

A coded instrument ensures no interference between your chest strap and your watch, necessary if you are training in busy gyms or trails where other signals may be encountered.

Workout history Yes
Wireless sync Yes
WiFi Yes
Button lock Yes
Batteries 2 AA (not included)
Routes 250
Haptic feedback No
Virtual partner

Allows user to monitor training goals with either a virtual partner or alarms.

Pause timer

Pauses the timer when slowing or stopping, and automatically resumes when moving again.

Pace alarm

An alarm that notifies you if you vary from a pre-set pace.

ANT+ compatible

Ensures seamless digital wireless communication between ANT+ devices. For example, data from an ultra-low power wireless sensor can be displayed on a bike computer or smartphone, then downloaded to a PC, etc.

Made in Taiwan