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GPSMAP 78 Series Owner’s Manual 7
2.4 GHz/ANT+ wireless communications protocol
GPS accuracy< 33 ft. (10 m) 95% typical useGPS is subject to accuracy degradation to 100 m 2DRMS under the U.S. DoD imposed Selective Availability (SA) Program when activated.
DGPSFrom 10 to 16 ft. (from 3 to 5 m) 95% typical (WAAS accuracy in North America)
AltimeterThe barometric altimeter is available only with the GPSMAP 78S and GPSMAP 78Sc.
CompassThe three-axis compass is available only with the GPSMAP 78S and GPSMAP 78Sc.
Maximizing Battery Life
Using the Battery Save Option
Use the battery save option to save
battery power and prolong battery life.
From the main menu, select
> Display > Battery Save > On.
Decreasing the Backlight
Extensive use of screen backlighting
can significantly reduce battery life.
You can adjust the backlight brightness
and decrease the backlight timeout to
maximize battery power.
Quickly press to open the
backlight status page.
2. Use the
Rocker to adjust the
Adjusting the Backlight
From the main menu, select Setup
> Display > Backlight Timeout.
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8 GPSMAP 78 Series Owner’s Manual
About the Batteries
See the Important Safety and Product
Information guide in the product
box for product warnings and other
The temperature rating for the device
may exceed the usable range of some
batteries. Alkaline batteries can rupture
at high temperatures. Alkaline batteries
lose a significant amount of their
capacity as temperature decreases. Use
lithium batteries when operating the
device in below-freezing conditions.
Selecting the Battery Type
1. From the main menu, select Setup
> System > Battery Type.
Alkaline, Lithium, or
When you do not plan to use the
device for several months, remove the
batteries. Stored data is not lost when
batteries are removed.
Go to http://buy.garmin.com,
or contact your Garmin dealer
for information about optional
accessories, preloaded map data
cards, fitness accessories, and
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GPSMAP 78 Series Owner’s Manual
Using Optional Fitness
NOTE: The Fitness option is available
only with the GPSMAP 78S and
Before you can use the fitness
accessory with your device, you must
install the accessory according to the
instructions that are included with the
You can use optional fitness accessories
including a heart rate monitor or a
cadence sensor with your device.
These accessories use ANT+™ wireless
technology to send data to the device.
1. Bring the device within range (3 m)
of the ANT+ accessory.
2. From the main menu, select
> Fitness. 3.
Select an option:
Select Heart Rate Monitor >
Select Bike Cadence Sensor
You can view heart rate and cadence
data by customizing your data fields
Tips for Pairing ANT+
Accessories with Your Garmin
Verify that the ANT+ accessory
is compatible with your Garmin
Before you pair the ANT+
accessory with your Garmin device,
move 10 m away from other ANT+
Bring the Garmin device within
range (3 m) of the ANT+ accessory.
After you pair the first time, your
Garmin device automatically
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0 GPSMAP 78 Series Owner’s Manual
recognizes the ANT+ accessory
each time it is activated. This
process occurs automatically when
you turn on the Garmin device and
only takes a few seconds when
the accessories are activated and
When paired, your Garmin device
only receives data from your
accessory, and you can go near
NOTE: The device is not compatible
with Windows® 95, 98, Me, or NT. It is
also not compatible with Mac® OS 10.3
The device supports the following file
Files from BaseCamp™ or
HomePort™. Go to www.garmin.
GPI custom POI files from the
Garmin POI Loader.
Installing a microSD Card
You can purchase microSD memory
cards from an electronics supplier, or
purchase preloaded detailed map data
cards from your Garmin dealer. In
addition to map and data storage, the
memory cards can be used to store files
such as images, cartridges, geocaches,
routes, waypoints, and custom POIs.
1. Slide the latch on the back of the
device, and remove the battery
cover and the batteries.
2. Slide down and pull out the metal
3. Align the metal contacts, and place
the card in the slot.
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GPSMAP 78 Series Owner’s Manual
microSD card slot
4. Push in and slide up the metal
5. Replace the batteries and the
Removing a microSD Card
1. Slide down and pull out the metal
2. Remove the card from the slot.
3. Push in and slide up the metal
4. Replace the batteries and the
Connecting the USB Cable
To prevent corrosion, thoroughly
dry the mini-USB port, the weather
cap, and the surrounding area before
charging or connecting to a computer.
1. Connect the USB cable to a USB
port on your computer.
2. Pull up the weather cap from the