Product Comparison

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GPSMAP® 66i
$599.99 USD
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GPSMAP® 66s
$399.99 USD
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GPSMAP® 66sr
$499.99 USD
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GPSMAP® 66st
$449.99 USD

You live for adventure. You want a button-operated GPS handheld and satellite communicator that’s made for challenging environments.

You live for adventure. You want a button-operated GPS handheld with satellite imagery and connected features — including weather radar.

You want our most accurate GPS handheld ever for the most challenging conditions. This one has a 3” screen, ABC sensors and satellite imagery.

You live for adventure. You want a button-operated GPS handheld with satellite imagery, topo maps and connected features — including weather radar.

Maps & Memory

Physical dimensions 2.5” x 6.4” x 1.4” (6.2 x 16.3 x 3.5 cm) 2.5" x 6.4" x 1.4" (6.2 x 16.3 x 3.5 cm) 2.5" x 6.4" x 1.4" (6.2 x 16.3 x 3.5 cm) 2.5" x 6.4" x 1.4" (6.2 x 16.3 x 3.5 cm)
Display size 1.5"W x 2.5"H (3.8 x 6.3 cm); 3" diag (7.6 cm) 1.5"W x 2.5"H (3.8 x 6.3 cm); 3" diag (7.6 cm) 1.5"W x 2.5"H (3.8 x 6.3 cm); 3" diag (7.6 cm) 1.5"W x 2.5"H (3.8 x 6.3 cm); 3" diag (7.6 cm)
Display resolution 240 x 400 pixels 240 x 400 pixels 240 x 400 pixels 240 x 400 pixels
Display type transflective color TFT transflective color TFT transflective color TFT transflective color TFT
Weight

8.1 oz (230 g) with batteries

8.1 oz (230 g) with batteries

8.1 oz (230 g) with batteries

8.1 oz (230 g) with batteries

Battery type rechargeable, internal lithium-ion 2 AA batteries (not included); NiMH or Lithium recommended Rechargeable, internal lithium-ion 2 AA batteries (not included); NiMH or Lithium recommended
Battery life

up to 35 hours at 10-minute tracking
Up to 200 hours at 30-minute tracking (power save mode)

Up to 16 hours
Up to 170 hours in expedition mode

Up to 36 hours
Up to 450 hours in expedition mode

Up to 16 hours
Up to 170 hours in expedition mode

Water rating IPX7 IPX7 IPX7 IPX7
MIL-STD-810 yes (thermal, shock, water) yes (thermal, shock, water) yes (thermal, shock, water) yes (thermal, shock, water)
High-sensitivity receiver
Interface high speed micro USB and NMEA 0183 compatible high speed micro USB and NMEA 0183 compatible high speed micro USB and NMEA 0183 compatible high speed micro USB and NMEA 0183 compatible
Memory/History 16 GB (user space varies based on included mapping) 16 GB 16 GB (user space varies based on included mapping) 16 GB (user space varies based on included mapping)

Maps & Memory

Preloaded maps

yes (TopoActive, routable)

yes (TopoActive; routable)

yes (topographic 100k for U.S. and Canada, not routable)

Ability to add maps
Basemap
Automatic routing (turn by turn routing on roads) for outdoor activities Yes (with optional mapping for detailed roads) Yes (with optional mapping for detailed roads)
Map segments 15000 15000 15000 15000
BirdsEye yes (direct to device) yes (direct to device) yes (direct to device) yes (direct to device)
Includes detailed hydrographic features (coastlines, lake/river shorelines, wetlands and perennial and seasonal streams)
Includes searchable points of interests (parks, campgrounds, scenic lookouts and picnic sites)
Displays national, state and local parks, forests, and wilderness areas
External memory storage yes (32 GB max microSD™ card) yes (32 GB max microSD™ card) yes (32 GB max microSD™ card) yes (32 GB max microSD™ card)
Waypoints/favorites/locations 10000 10000 10000 10000
Tracks 250 250 250 250
Track log 20000 points, 250 saved gpx tracks, 300 saved fit activities 20000 points, 250 saved gpx tracks, 300 saved fit activities 20000 points, 250 saved gpx tracks, 300 saved fit activities 20000 points, 250 saved gpx tracks, 300 saved fit activities
Routes 250, 250 points per route; 50 points auto routing 250, 250 points per route; 50 points auto routing 250, 250 points per route; 50 points auto routing 250, 250 points per route; 50 points auto routing
Rinex logging

Sensors

GPS
GLONASS
Galileo
QZSS
Barometric altimeter
Compass Yes (tilt-compensated 3-axis) Yes (tilt-compensated 3-axis) Yes (tilt-compensated 3-axis) Yes (tilt-compensated 3-axis)
GPS compass (while moving)
Multi-band frequency support

Daily Smart Features

Connect IQ™ (downloadable watch faces, data fields, widgets and apps)
Smart notifications on handheld
Weather
VIRB® Remote
Pairs with Garmin Connect™ Mobile
Active Weather 

Safety and Tracking Features

LiveTrack

Outdoor Recreation

Point-to-point navigation
Compatible with BaseCamp™
Area calculation
Hunt/fish calendar
Sun and moon information
XERO™ Locations
Geocaching-friendly yes (Geocache Live) yes (Geocache Live) yes (Geocache Live) yes (Geocache Live)
Custom maps compatible yes (500 custom map tiles) yes (500 custom map tiles) yes (500 custom map tiles) yes (500 custom map tiles)
Picture viewer
inReach remote widget
LED beacon flashlight

inReach® Features

Interactive SOS
Send and receive text messages to SMS and email
Send and receive text messages to other inReach device
Exchange locations with other inReach device
MapShare compatible with tracking
Virtual keyboard for custom messaging
Send waypoints to MapShare during trip
Send route selection to MapShare during trip
inReach remote compatible

Outdoor Applications

Compatible with Garmin Explore™ app
Garmin Explore website compatible

Connections

Wireless connectivity

yes (Wi-Fi®, BLUETOOTH®, ANT+®)

yes (Wi-Fi®, BLUETOOTH®, ANT+®)

yes (Wi-Fi®, BLUETOOTH®, ANT+®)

yes (Wi-Fi®, BLUETOOTH®, ANT+®)