GPSMAP 78sc is the Perfect Companion in all Outdoor Pursuits


The GPSMAP 78sc is a hand-held worldwide shaded relief base map for boaters and water sports enthusiasts who want to run with the best of them. It is slim and lightweight and floats on water. It is intentionally large, though not too big, to give internal air space for water flotation ability. Its control buttons are located at the screen top. It is very fast in finding satellites and screen display switching.

The GPSMAP 78sc includes pre-loaded U.S. coastal blue chart g2 data including AK, HI and Bahamas, for a great day on the waters and the City Navigator NT map data for road turn-by-turn routing. It features a 3-axis compass, a barometric altimeter, a crisp coloured mapping, a high-sensitivity receiver and new moulded rubber side grips. It also provides a micro-SD card slot for loading additional maps. It is the perfect companion for all your outdoor pursuits.Get this great  GPSMAP 78sc on sale here!



The tilt-compensated 3-axis electronic compass of the GPSMAP 78sc is set for quick calibration and quick movement reaction and accurate. It offers an option for map orientation to either compass heading, i.e. the direction you point the unit or from the track, i.e. the direction you are moving in that is oriented up.

Marine Functions

The GPSMAP 78sc has a “Man Overboard” button that marks the position when pressed and held. It also gives you the option to immediately navigate back to the marked position. It also has an “Anchor Drag” alarm and low and high water depth alarms, that key off the chart depth readings from low tide. All these alarms can be adjusted by the user. Its pre-loaded g2 coastal marine charts are very readable in the bright sunlight.

Data Sharing

Sharing data with your friends is easy with the GPSMAP 78sc. You can share your waypoints, tracks, routes and geo-caches with users of other compatible devices. You can also send your favourite fishing spot location to a friend. This will assist him to easily find where you actually are. Transferring of information from your GPSMAP 78sc to similar units is a matter of pressing ‘SEND’ in your unit.

GPSMAP 78sc – Geo-caching

The GPSMAP 78sc supports the geo-caching of GPX files, designed for geo-cache and detail download straight to your unit. Hunting for caches is just a simple upload of the GPX file to your unit.

Paperless System

The GPSMAP 78sc stores and displays key information. This includes location, terrain, difficulty, hints and descriptions. This eliminates manual entry of coordinates and paper print outs. The unit offers efficiency improvement and environmental care by your going paperless.

Map Adding

The addition of more maps in your GPSMAP 78sc is easy with Garmin’s wide array of detailed marine, topographic and road maps, all available on micro-SD cards. The location of the card slot inside the waterproof battery compartment of the unit ensures its not getting wet.

The GPSMAP 78sc also supports the Birds-Eye Satellite Imagery for satellite image download to your unit for consequent map integration. A subscription to the Birds-Eye Satellite Imagery system is required, though.

The GPSMAP 78sc is also compatible with Custom Maps, a free software for paper and electronic map transformation into downloadable maps for your unit.

Specifications of GPSMAP 78sc

Physique & Performance

The dimensions of the GPSMAP 78sc in width by height by depth is 2.6” x 6.0” x 1.2” or 6.6 cm. x 15.2cm x 3.0 cm. Its display size in width by height is 1.6” x 2.2” or 4.1 cm. x 5.6 cm. Its diagonal display size is 6.6 cm. Its display type is a transflective 65-L colour TFT with a display resolution in width by height of 160 pixels x 240 pixels.

The GPSMAP 78sc weighs 7.7 ounces or 218.3 grams, including its 2 AA batteries with a 20-hour battery life. The batteries are not included in the unit purchase. NiMH or Lithium batteries are recommended for use with the unit.

The GPSMAP 78sc is IPX7 waterproof and floats on water. It has a high-sensitivity receiver and is high-speed USB and NMEA 0183 compatible.

Maps and Memory

The GPSMAP 78sc is a base map with a built-in memory of 1.7 GB. It is capable of map upgrade through its micro-SD card slot. The micro-SD card does not come with the purchase of the unit.

The GPSMAP 78sc can store up to 2,000 waypoints, favourites and locations and 200 routes. It can store a track log up to 10,000 points and 200 saved tracks.

Features of GPSMAP 78sc

The GPSMAP 78sc offers automatic routing, i.e. road turn-by-turn routing, with optional mapping for detailed roads, a tilt-compensated 3-axis electronic compass and a barometric altimeter.

The GPSMAP 78sc is paperless and therefore geo-caching friendly and is compatible with the Custom Maps software. It can do photo navigation, i.e. navigate to geo-tagged photos. It provides a hunt and fish calendar, sun and moon information, tide tables and area calculation.

The GPSMAP 78sc has custom POIs, i.e. ability to add additional points of interest, unit-to-unit transfer, i.e. wireless data sharing with similar units. It is compatible with Garmin Connect, i.e. an online community for data analysis, categorization and sharing.

Garmin GPSMAP 78sc at high-end of new line of Garmin handheld GPS devices

Garmin GPSMAP 78sc

The Garmin GPSMAP 78sc represents the high-end in the new line of handheld GPS devices from Garmin aimed for marine use. The other devices in this line are the GPSMAP 78 and GPSMAP 78s. It features rubber side grips that make it easy to keep a hand on the device while keeping it out of the water at the same time.

It has a 3-axis electronic compass that is relatively accurate in any orientation. Garmin GPSMAP 78sc comes with a transflective 65k colour display and features a combination of a case and a weight that floats on the water. It supports wireless data exchange with other Garmin wireless devices.

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Garmin GPSMAP 78sc

About 20 hours of run time can be expected from the 2 AA batteries of the Garmin GPSMAP 78sc. It offers quick satellite acquisition, not only because you are on a boat clearly out in the open but also because it uses HotFix for fast satellite acquisition. HotFix is a software patch applied to live running systems.

The 1.7 GB of onboard memory of the Garmin GPSMAP 78sc includes a micro-SD card slot. It comes with a built-in worldwide base map with the addition of the Garmin Blue Chart g2 maps for the U.S. coastal waters. These maps support Garmin’s systems of Custom Maps and Birds-Eye Satellite Images.

Garmin GPSMAP 78sc – Electronic Compass

The Garmin GPSMAP 78sc system can only provide information about its own location, with an accuracy limitation of within 10 meters from the spot you are currently standing.

The Garmin GPSMAP 78sc cannot provide either speed or direction information at its core. However, it can derive speed and direction with a history of where it has been. Having a GPS reading from two locations and the time from each reading, it can determine the average speed and direction between the two readings.

In order for the Garmin GPSMAP 78sc to determine direction, you need to be moving. It cannot determine what direction you are facing if you are standing still. Without movement, the GPS would normally show the last recorded direction.

An electronic compass, on the other hand, does not rely on GPS signals for direction determination. It does not rely on movement to know your direction. The downside of using an electronic compass is, having to cram additional hardware inside the GPS leading to a more expensive unit and shorter battery life for the unit.

Outdoor and recreational enthusiasts have to make a decision of how important this feature of the electronic compass is. Alternatively, they can always determine and confirm the direction they are heading by comparison of a track log to the map, or by simply walking a short distance while doing a compass watch.

Garmin GPSMAP 78sc – Satellite Acquisition

In order for a GPS device like Garmin GPSMAP 78sc to determine your location, it needs to listen to the GPS satellite network. In order for it to listen to the network, it helps the GPS device to predict where to listen for the signal. In order for it to predict where to listen, it helps the GPS device to know where you are.

A good, clear view of the sky makes satellite acquisition of a GPS device like Garmin GPSMAP 78sc faster and quicker. While buildings and trees have noticeable impact on the satellite acquisition performance of a GPS device, overcast skies do not. External antennas can assist your GPS device in its satellite acquisition.

It normally takes 20 minutes for a Garmin GPSMAP 78sc device to find a signal, although, it often takes less. Once it does find your location, it is best to have it sit in this location for about 30 minutes. When a GPS device is turned on with a signal, it downloads almanac data from the satellites. This data will help the device find the satellites much faster in the future because it is better enabled to predict where to listen to for the satellites. Moving your Garmin GPSMAP 78sc device a large distance, i.e. more than 100 miles, where it was last used, will make your GPS device take a longer time in its initial signal acquisition.

It is recommended to check for software updates for your Garmin GPSMAP 78sc device. Some manufacturers offer updates on a periodic basis that helps the GPS device in its acquisition of almanac data from the satellites.

Birds-Eye Satellite Images

The Birds-Eye Satellite Images supported by the Garmin GPSMAP 78sc offers you the addition of satellite imagery to your maps without having to do map building. These maps are high-resolution, sub-meter colour images capturing the world in brilliant clarity and detail. These maps cam be stored in the internal memory of your device, or in SD-cards.

For a one-year subscription of $30, you can use the Garmin BaseCamp software to transfer maps with satellite imagery to your unit. The subscription, though, is applicable only to one device and subsequent downloads are locked to that one device.Try Garmin GPSMAP 78sc now!

Garmin GSPMAP 78sc review says the GSPMAP 78sc is the newest Garmin handheld fully functional marine device

Garmin GSPMAP 78sc Review

The Garmin GSPMAP 78sc Review says that the GSPMAP 78sc is the newest handheld in the outdoor GPS line of Garmin. It is a fully functional device meant for marine trips, with no need for serious software fixes. No software crashes or bugs have been experienced in the use of the device. It includes the Garmin Custom Maps.

Garmin GPSMAP  Models

The Garmin line of handheld GPS consists of 3 models, the GSPMAP 78 with a coloured screen, the GSPMAP 78s with added features of a barometric altimeter, electronic tri-axial compass, micro-SD card slot and wireless data transfer and the GSPMAP 78sc with built-in Blue Chart g2 coastal charts according to the Garmin GSPMAP 78sc Review.

Garmin GSPMAP 78sc review

Physical Features

The Garmin GSPMAP 78sc Review affirms that the GSPMAP 78sc weighs 8.2 ounces with a 20-hour battery life using NiMH or Lithium batteries, a 17-hour battery life using alkaline batteries and an estimated 30-hour battery life using NiMH rechargeable batteries.

The GPSMAP 78sc has a 1.7 GB built-in memory for maps and imagery files. Its USB port, along withs MCX external antenna connector, is located under the rubber protector that is above the battery case according to the Garmin GSPMAP 78sc Review.

The GPSMAP 78sc uses a patch antenna as the horizontal handling of the unit results to the best reception. According to the Garmin GSPMAP 78sc Review it has a USB, a serial and an external GPS antenna jack, under protective cover and located above its mounting spine.

In the Garmin GSPMAP 78sc Review its smaller screen provides better backlight visibility with a lower resolution and appears to be more rugged and durable compared to recent outdoor touch screens. It presents data in a larger font setting but shows less of a map because of its smaller screen. A negative feature of the screen is its terrain shading feature. The screen appears very dark in steep terrain, particularly in a forest-type area. This feature, though, can be switched off when the display appears too dark.

The GSPMAP 78sc does not have a built-in camera, but instead supports geo-tagged photos that can be loaded to its memory, with photo navigation ability. There is no dedicated picture viewer either, although you can see the screen photos during navigation, but cannot zoom in or pan the photos according to the Garmin GSPMAP 78sc Review.

Garmin GSPMAP 78sc Review – Wireless Data Transfer

The Garmin GSPMAP 78sc Review further says that the GSPMAP 78sc allows wireless data transfer of waypoints, routes, tracks and geo-caches between Garmin handhelds. This wireless data transmission is achieved from 10 to 20 feet between units, depending on the unit orientation, the greatest range obtainable with the horizontal handling of the units.

The waypoints, tracks, routes and geo-caches are handled as .gpx files. The management of these files are done with the free Garmin BaseCamp software. The changes incorporated in the file using the BaseCamp software are automatically incorporated in the file copy in the device according to the Garmin GSPMAP 78sc Review.

Birds-Eye Imagery

The Garmin GSPMAP 78sc Review states that the GSPMAP 78sc has the ability to add aerial imagery, marketed as Birds-Eye Imagery by Garmin, to the maps of the device. However, the Birds-Eye images seem to be of inferior quality when compared to the images from Google Earth, Microsoft MSR Maps or TerraServer.

Digital Elevation Model

The Garmin GSPMAP 78sc Review further states that the GSPMAP 78sc comes with the Worldwide Digital Elevation Model a.k.a. DEM, Base Map providing terrain shading.

DEM is a digital representation of a ground surface elevation. It can be represented as a square grid or as a triangular irregular network. It is commonly built with the use of remote sensing techniques, but can also be built from land surveying. It is often used in geographic information systems. It is the most common basis for digitally-produced relief maps. The interpolation of DEM elevation grid data allows GPS maps to display elevation contour lines according to Garmin GSPMAP 78sc Review.

Marine Unit

The Garmin GSPMAP 78sc Review confirms that the GSPMAP 78sc is classified as a marine unit, having tide tables. The selection of the electronic compass and barometer sensors and built-in Blue Chart g2 Coastal Charts are enabled in this device. The device becomes a mass storage unit when connected to a computer, thus, is unable to output position data through its USB port. It has an NMEA serial output, with two modes, i.e. Autopilot Mode On or Off, allowing access to the nRoute system. It also has an NMEA serial connector.

Garmin GSPMAP 78sc Review – Accuracy

The Garmin GSPMAP 78sc Review asserts that the GSPMAP 78sc has WAAS accuracy within 2 meters after a waypoint over a 1st order survey marker average. It has a compass accuracy within 1 degree with a 3-axis calibration and a True set heading.

The GSPMAP 78sc only records barometric pressure when turned on, giving a less valuable barometer plot.

Satellite Acquisition

The Garmin GSPMAP 78sc Review concurs that the GSPMAP 78sc is a high-sensitive receiver, with a good reception and a quick satellite fix re-acquisition. It features paperless geo-caching and support geo-caching field notes as well.