GSD™ 26 Installation InstructionsTo obtain the best performance and to avoid damage to yourboat, install the device according to these instructions.Read all installation instructions before proceeding with theinstallation. If you experience difficulty during the installation,contact Garmin Product Support.Registering Your DeviceHelp us better support you by completing our online registrationtoday.• Go to http://my.garmin.com.• Keep the original sales receipt, or a photocopy, in a safeplace.Loading the New Software on a Memory CardThe device may contain a software-update memory card. If so,follow the instructions provided with the card. If a softwareupdate memory card is not included, you must copy thesoftware update to a memory card.1 Insert a memory card into the card slot on the computer.2 Go to www.garmin.com/support/software/marine.html.3 Select Download next to “Garmin Marine Network with SDcard.”4 Read and agree to the terms.5 Select Download.6 Select Run.7 Select the drive associated with the memory card, and selectNext > Finish.Updating the Device SoftwareBefore you can update the software, you must obtain asoftware-update memory card or load the latest software onto amemory card.1 Turn on the chartplotter.2 After the home screen appears, insert the memory card intothe card slot.NOTE: In order for the software update instructions toappear, the device must be fully booted before the card isinserted.3 Follow the on-screen instructions.4 Wait several minutes while the software update processcompletes.The device returns to normal operation after the softwareupdate process is complete.5 Remove the memory card.NOTE: If the memory card is removed before the devicerestarts fully, the software update is not complete.Contacting Garmin Product Support• Go to www.garmin.com/support and click Contact Supportfor in-country support information.• In the USA, call (913) 397.8200 or (800) 800.1020.• In the UK, call 0808 2380000.• In Europe, call +44 (0) 870.8501241.Important Safety InformationWARNINGSee the Important Safety and Product Information guide in theproduct box for product warnings and other importantinformation.You are responsible for the safe and prudent operation of yourvessel. Sonar is a tool that enhances your awareness of thewater beneath your boat. It does not relieve you of theresponsibility of observing the water around your boat as younavigate.CAUTIONFailure to install and maintain this equipment in accordance withthese instructions could result in damage or injury.Always wear safety goggles, ear protection, and a dust maskwhen drilling, cutting, or sanding.NOTICEWhen drilling or cutting, always check what is on the oppositeside of the surface.This equipment must be installed by a qualified marine installer.TransducersA transducer is required to send and receive a sonar signal fromthe sounder. Proper transducer selection and installation arecritical to the operation of the device. Because mountinglocations vary, see your local Garmin dealer or contact GarminProduct Support for more information. Go to www.garmin.com/transducers to select a transducer.Installation PreparationNOTICEThis device must be installed according to these instructions toget the best possible performance. If you experience difficultywith the installation, contact Garmin Product Support.Because every boat is different, you must carefully plan theGSD 26 sounder installation.1 Select a mounting location.2 Mount the sounder.3 Connect the sounder to the Garmin Marine Network and topower.4 Connect the sounder to the transducer.Tools Needed• Drill• #8 (5 mm) drill bit for mounting surface• 1 1/4 in. (32 mm) paddle drill bit or hole saw for mountingsurface• #2 Phillips screwdriver• 3 mm flat screwdriver• Cable ties (optional)• Wire cutter• Wire stripper• 1 in. (24 mm) and 19/32 in. (15 mm) wrenches• Marine sealant (optional)Mounting the SounderMounting Location Considerations• The sounder must be mounted in a location where it cannotbe submerged.August 2014 Printed in Taiwan 190-01821-02_0A