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GPS AND CARTOGRAPHY (with 937c DF Combo and 937c Combo models only)
The 937c DF Combo and 937c Combo models use GPS and sonar to determine your position, display it on a grid, and provide detailed underwater information. The Global Positioning System (GPS) is a satellite navigation system designed and maintained by the U.S. Department of Defense. GPS was originally intended for military use; however,
Your 937c DF Combo and 937c Combo models use the GPS Receiver to determine the position of the boat automatically, and uses the zoom level settings on a particular view to select the best chart to display. See Viewing Cartography for more information.
MULTI-MEDIA CARD (MMC)/SD SLOT
civilians may also take advantage of its highly accurate position capabilities, typically within +/- 10 meters, depending on conditions. This means that 95% of the time, the GPS receiver will read a location within 10 meters of your actual position. The GPS Receiver also uses information from WAAS (the Wide Area Augmentation System), EGNOS (the European Geostationary Navigation Overlay Service), and MSAS (the MTSAT Satellite Augmentation System) satellites if they are available in your area.
GPS uses a constellation of satellites that continually send radio signals to the earth. Your present position is determined by receiving signals from up to 12 satellites and measuring the distance from the satellites. The GPS Receiver, when attached to your 937c DF Combo or 937c Combo model, allows you to combine
Multi-Media Card
(MMC/SD) Slot
The 900 Series™ 937c DF Combo and 937c Combo models support cartography, and have two
931c DF and 931c models have one MMC/SD slot and do not support cartography.
when it is connected to a GPS Receiver:
•View current position
•View current track (breadcrumb trail)
•View precision speed and heading from your GPS receiver
•Save tracks, waypoints and routes
•Travel a route and navigate from one waypoint to the next.
NOTE: Only the 937c DF Combo and 937c Combo models support Navionics® Gold Charts marine cartography and Navionics® HotMaps™ 2004 Gold for inland fishing. The 900 Series™ does not support Navionics® Classic Charts.
The 937c DF Combo and 937c Combo models also come with a
On any model, use the MMC/SD cards to update the software version of your control head. To update the software in your control head, plug in the appropriate MMC/SD card that contains a software update file; the unit will recognize it, will tell you what software version your control head is currently running, and will ask you if you want to update the software in the unit to match that on the MMC/SD card. You can obtain software updates from the www.humminbird.com website.
Use the illustration to locate the position of the MMC and SD slot cover, remove the cover, and then insert an MMC and/or an SD card into one or both slots - either slot can accept either an MMC or an SD card. The label on both types of cards should face down and away from you so that you’re looking at the back of the card. Press down on the card until it clicks into place, then replace the slot cover and tighten the screw snugly - do NOT overtighten, as this will not improve water resistance, and may damage the cover.
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