Garmin GPSMAP 820 Installation Instructions - Page 4

Connecting the Device to a Remote GPS Antenna This device has an internal GPS receiver, but some installations, such as a flush-mount installation, may not allow a view of the sky needed to calculate your GPS position. In this situation, you can install a Garmin external GPS antenna and connect it to the device to provide GPS information. Devices that can receive information from a Garmin external GPS antenna have a port labeled EXT GPS. 1 Follow the instruction provided with your Garmin external GPS antenna to install it on your boat correctly. 2 Route the antenna cable to the back of your device, away from sources of electrical interference. 3 Connect the antenna cable to the EXT GPS port on your device. NMEA 2000 Considerations NOTICE If you have an existing NMEA 2000 network on your boat, it should already be connected to power. Do not connect the NMEA 2000 power cable to an existing NMEA 2000 network, because only one power source should be connected to a NMEA 2000 network. If you are installing a NMEA 2000 power cable, you must connect it to the boat ignition switch or through another in-line switch. NMEA 2000 devices will drain your battery if the NMEA 2000 power cable is connected to the battery directly. NMEA 2000 compatible models can connect to a NMEA 2000 network on your boat to share data from NMEA 2000 compatible devices such as a VHF radio. The necessary NMEA 2000 cables and connectors are sold separately. If you are unfamiliar with NMEA 2000, you should read the "NMEA 2000 Network Fundamentals" chapter of the Technical Reference for NMEA 2000 Products. To download this document, select Manuals on the product page for your device at www.garmin.com. The port labeled NMEA 2000 on the back of the device is used to connect it to a standard NMEA 2000 network. Item Description NMEA 2000 compatible Garmin device NMEA 2000 drop cable NMEA 2000 power cable Ignition or in-line switch 12 Vdc power source NMEA 2000 terminator or backbone cable NMEA 2000 T-connector NMEA 2000 terminator or backbone cable Loading the New Software on a Memory Card The device may contain a software-update memory card. If so, follow the instructions provided with the card. If a software update memory card is not included, you must copy the software 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 SD card. " 4 Read and agree to the terms. 5 Select Download. 6 Select Run. 7 Select the drive associated with the memory card, and select Next > Finish. Updating the Device Software Before you can update the software, you must obtain a software-update memory card or load the latest software onto a memory card. 1 Turn on the chartplotter. 2 Insert the memory card into the card slot. 3 Follow the on-screen instructions. 4 Wait several minutes while the software update process completes. The device returns to normal operation after the software update process is complete. 5 Remove the memory card. Specifications Physical Specifications Device Eight-inch models Specification Dimensions (W×H×D) Display size (W×H) Weight Ten-inch models Dimensions (W×H×D) Display size (W×H) All models Weight Temperature range Material Measurement 294 mm (11. 58 in. ) × 188 mm (7. 4 in) × 74 mm (2. 91 in. ) 162 mm (6. 38 in. ) × 121. 5 mm (4. 78 in. ) 1. 6 kg (3. 53 lb. ) 360 mm (14. 17 in. ) × 236 mm (9. 29 in) × 75 mm (2. 95 in. ) 211. 2 mm (8. 31 in. ) × 158. 4 mm (6. 24 in. ) 2. 2 kg (4. 85 lb. ) From 5° to 131°F (from -15° to 55°C) Polycarbonate plastic Electrical Specifications Device All models Eight-inch models Ten-inch models Specification Input power Fuse NMEA 2000 LEN NMEA 2000 draw Compass-safe distance Max. power usage at 10 Vdc Typical current draw at 12 Vdc Max. current draw at 12 Vdc Max. power usage at 10 Vdc Typical current draw at 12 Vdc Max. current draw at 12 Vdc Measurement 10-32 Vdc 6 A, fast-acting 2 100 mA max. 30 cm (11. 8 in. ) 35 W 1. 5 A 3. 5 A 40 W 2. 0 A 4. 0 A 4