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GARMIN GPSMAP 78 & 86 Series GPS Comparison
Here's how the models are different

Click here to compare with other Garmin handhelds
gpsmap 86s
gpsmap 86sc
gpsmap 86i
gpsmap 86sci
Garmin GPSMAP 78
Garmin GPSMAP 78s
Garmin GPSMAP 78sc
Unit dimensions:
2.65" x 7" x 1.7" (6.75 x 17.8 x 4.4 cm)
2.65" x 7" x 1.7" (6.75 x 17.8 x 4.4 cm)
2.75" x 7" x 1.7" (7 x 17.8 x 4.4 cm)
2.75" x 7" x 1.7" (7 x 17.8 x 4.4 cm)
2.6" x 6.0" x 1.2"
(6.6 x 15.2 x 3.0 cm)
2.6" x 6.0" x 1.2"
(6.6 x 15.2 x 3.0 cm)
2.6" x 6.0" x 1.2"
(6.6 x 15.2 x 3.0 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)
1.43" x 2.15" (3.6 x 5.5 cm); 2.6" diag (6.6 cm)
1.43" x 2.15" (3.6 x 5.5 cm); 2.6" diag (6.6 cm)
1.43" x 2.15" (3.6 x 5.5 cm); 2.6" diag (6.6 cm)
Display resolution:
240 x 400 pixels
240 x 400 pixels
240 x 400 pixels
240 x 400 pixels
160 x 240 pixels
160 x 240 pixels
160 x 240 pixels
Display type:
transflective, 65K color TFT
transflective, 65K color TFT
transflective, 65K color TFT
transflective, 65K color TFT
transflective, 65-K color TFT
transflective, 65-K color TFT
transflective, 65-K color TFT
Weight:
9.59 oz (272 g)
9.59 oz (272 g)
9.59 oz (272 g)
9.59 oz (272 g)
7.7 oz (218.3 g) with batteries
7.7 oz (218.3 g) with batteries
7.7 oz (218.3 g) with batteries

Battery:

rechargeable internal lithium ion
rechargeable internal lithium ion
rechargeable internal lithium ion
rechargeable internal lithium ion
2 AA batteries (not included); NiMH or Lithium recommended
2 AA batteries (not included); NiMH or Lithium recommended
2 AA batteries (not included); NiMH or Lithium recommended
Battery life:
Up to 40 hours (standard mode); up to 200 hours (expedition mode)
Up to 40 hours (standard mode); up to 200 hours (expedition mode)
Up to 35 hours in 10-minute tracking mode; up to 200 hours (expedition mode)
Up to 35 hours in 10-minute tracking mode; up to 200 hours (expedition mode)
20 hours
20 hours
20 hours
Waterproof:
yes (IPX7)
yes (IPX7)
yes (IPX7)
yes (IPX7)
yes (IPX7)
yes (IPX7)
yes (IPX7)
Floats:
✔
✔
✔
✔
✔
✔
✔
High-sensitivity receiver:
✔
✔
✔
✔
✔
✔
✔
Interface:
USB and NMEA 0183 compatible
USB and NMEA 0183 compatible
USB and NMEA 0183 compatible
USB and NMEA 0183 compatible
USB and NMEA 0183 compatible
high-speed USB and NMEA 0183 compatible
high-speed USB and NMEA 0183 compatible
 
Basemap:
✔
✔
✔
✔
✔
✔
✔
Preloaded maps:
x
yes (preloaded BlueChart g3 U.S. coastal charts)
x
yes (preloaded BlueChart g3 U.S. coastal charts)
x
x
yes (preloaded U.S. coastal charts)
Ability to add maps:
✔
✔
✔
✔
✔
✔
✔
Built-in memory:
16GB
16GB
16GB
16GB
1.7 GB
1.7 GB
1.7 GB
Accepts data cards:
microSD™ card (not included)
microSD™ card (not included)
microSD™ card (not included)
microSD™ card (not included)
microSD™ card (not included)
microSD™ card (not included)
microSD™ card (not included)
Waypoints:
10,000
10,000
10,000
10,000
2000
2000
2000
Routes:
250
250
250
250
200
200
200
Track log:
20,000 points, 250 saved gpx tracks, 300 saved fit activities
20,000 points, 250 saved gpx tracks, 300 saved fit activities
20,000 points, 250 saved gpx tracks, 300 saved fit activities
20,000 points, 250 saved gpx tracks, 300 saved fit activities
10,000 points, 200 saved tracks
10,000 points, 200 saved tracks
10,000 points, 200 saved tracks
 
Automatic routing:
yes (with optional mapping for detailed roads)
yes (with optional mapping for detailed roads)
yes (with optional mapping for detailed roads)
yes (with optional mapping for detailed roads)
yes (with optional mapping for detailed roads)

yes (with optional mapping for detailed roads)

yes (with optional mapping for detailed roads)
Electronic compass:
yes (tilt-compensated, 3-axis)
yes (tilt-compensated, 3-axis)
yes (tilt-compensated, 3-axis)
yes (tilt-compensated, 3-axis)
x
yes (tilt-compensated, 3-axis)
yes (tilt-compensated, 3-axis)
Barometric altimeter:
✔
✔
✔
✔
x
✔
✔
Photo navigation:
x
x
x
x
✔
✔
✔
Picture viewer:
✔
✔
✔
✔
✔
✔
✔
Custom maps compatible:
✔
✔
✔
✔
✔
✔
✔
Geocaching-friendly:
yes (paperless)
yes (paperless)
yes (paperless)
yes (paperless)
yes (paperless)
yes (paperless)
yes (paperless)
Hunt/fish calendar:
✔
✔
✔
✔
✔
✔
✔
Sun and moon information:
✔
✔
✔
✔
✔
✔
✔
Tide tables:
x
x
x
x
✔
✔
✔
Area calculation:
✔
✔
✔
✔
✔
✔
✔
Custom POIs:
✔
✔
✔
✔
✔
✔
✔
Unit-to-unit transfer:
✔
✔
✔
✔
x
✔
✔
Garmin Connect™ compatible:
✔
✔
✔
✔
✔
✔
✔
Smart notifications:
✔
✔
✔
✔
x
x
x
 
Interactive SOS
x
x
✔
✔
x
x
x
Send and receive text messages to SMS and email
x
x
✔
✔
x
x
x
Send and receive text messages to other inReach device
x
x
✔
✔
x
x
x
Exchange locations with other inReach device
x
x
✔
✔
x
x
x
MapShare compatible with tracking
x
x
✔
✔
x
x
x
Virtual keyboard for custom messaging
x
x
✔
✔
x
x
x
inReach remote compatible
x
x
✔
✔
x
x
x
Boat data streaming
✔
✔
✔
✔
x
x
x
Functions as a remote control for Garmin autopilot and select FUSION® marine products
✔
✔
✔
✔
x
x
x
Adjustable GPS filter 
✔
✔
✔
✔
x
x
x
 
(1) Electronic compass: Provides direction information while you are standing still.
(2) Barometric altimeter: Gives altitude accurate to 10 feet with proper calibration.
(3) Elevation profiling: Records your "trip profile" in elevation
(4) Area calculation: Calculates the area enclosed by the track log
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