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Garmin > 
Item#: N82E16858108484

GARMIN 2.6" GPS Navigation

  • 2.6" TFT
  • 1.7GB Memory
  • 20 hours Battery Life
  • 2 AA batteries (not included); NiMH or Lithium recommended

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

For boaters and watersports enthusiasts who want to run with the best, the rugged GPSMAP 78sc includes preloaded U.S. coastal charts and features a 3-axis compass, barometric altimeter, crisp color mapping, a high-sensitivity receiver, new molded rubber side grips, plus a microSD card slot for loading additional maps. And it floats!. GPSMAP 78sc comes with built-in BlueChart g2 coastal charts and a worldwide basemap with imagery - perfect for all your outdoor pursuits. Map detail includes shorelines, depth contours, navaids, harbors, marinas and more for the U.S. and Bahamas. And, like the rest of the 78-series, 78sc is IPX7 waterproof and even floats in water.




High-sensitivity receiver
Accuracy (Position)
< 10m, 95% typical
Accuracy With WAAS (Position)
3 - 5m, 95% typical




Custom POIs (ability to add additional points of interest)
Automatic routing (turn by turn routing on roads): with optional mapping for detailed roads


Support Memory Cards


Screen Size
Screen Format
Display Resolution
160 x 240
Display Features
65-K color


PC InterFace Supported

Digital Player

Digital Player
Supported Formats


Battery Type
2 AA batteries (not included); NiMH or Lithium recommended
Battery Life
20 hours


Min Operating Temperature
Max Operating Temperature


GPS System Features
Waterproof (IPX7)


Track log: 10,000 points, 200 saved tracks

Electronic compass (tilt-compensated, 3-axis)

Barometric altimeter

Geocaching-friendly (paperless)

Custom maps compatible

Photo navigation (navigate to geotagged photos)

Hunt/fish calendar

Sun and moon information

Tide tables

Area calculation

Unit-to-unit transfer (shares data wirelessly with similar units)

Garmin Connect compatible (online community where you analyze, categorize and share data)

Dimensions & Weight

7.7 oz.

Package Contents

Whats in the Box
Wrist strap
USB cable
Quick start manual
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

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  • Michael K.
  • 10/4/2010 7:47:56 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month

5 out of 5 eggsGreat for Small Boat Use and Geocaching

Pros: Lots of marine features and alarms, such as anchor drag alarm, low water depth alarm, (from map depths) Man Overboard function, etc. The coastal marine plots seem fairly good and accurate to the paper chart I have of Upper Chesapeake Bay.

Very fast at screen changes and map scrolling (for a handheld). Has great accuracy with WAAS/Egnos turned on. Fast satellite lock.
Decent screen visibility in bright sunlight.

I was afraid it was going to be large due to the extra long design (to allow it to float on the water). I find it not too large, and it's OK while hiking. It's not too heavy either.

Large onboard memory (~1.6GB?) with ability to add maps also to micro SD card slot.

Has extensive Geocaching functions, although you have to purchase other map software or micro SD cards.
I find the 2 AA battery life is pretty good.

Cons: Price kinda high, but the accurate marine charts are worth it. Base maps (on land only--the marine charts are good) are a joke, and optional 100K topo map software are still sparsely populated.

Other Thoughts: I got my Garmin 78sc a couple of weeks ago, to use not only on the water (Chesapeake Bay), but for hiking and geocaching. By now I've sailed for 3.5 days,(about 18 hours total run-time), before needing to change the alkaline batteries, so I'm fairly satisfied with the battery life. I am now trying NiMH rechargeables, and they seem to last fine, after a 4 hour trip, seems to have plenty of juice left. Always Bring spare batteries sailing.

Also, having the buttons on top of the screen are a little weird, but it's not a big issue in use. It's very fast in finding the satellites and switching display screens, etc. The built in electronic compass (multi-axis)calibrates quickly, and reacts quickly to movement, but seems very accurate. There is an option to have the map orient to either the compass heading (direction you point the GPS) or from the track (direction you were moving in.

Very satisfied with this hand-held marine plotter, as I can use it hiking also (with optional maps).

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Item#: N82E16858108484
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