Pub.
Addendum I
Additional Instructions for
Lowrance M68i S/Map
Your sonar/GPS unit, the M68i, functions exactly like the M68 de- scribed in the manual provided (part
NMEA 0183 Cable Connections
NMEA is a standard communications format for marine electronic equipment. The M68i can send information to any device that receives NMEA 0183 data. This allows the unit to work with VHF marine radios equipped with the Digital Selective Calling (DSC) distress call feature.
To send NMEA 0183 data, the M68i has one NMEA 0183 version 2.0 communication port. The com port can be used to send NMEA format- ted data such as your current position.
The provided M68i data cable plugs into the accessory socket on the right side of the back of your unit's case. This socket can connect either an accessory such as a speed or temperature sensor or a NMEA 0183 data cable. The data cable ends in two wires that connect to your VHF radio or other NMEA device. The M68i uses the yellow wire to transmit and the black shield wire for signal ground.
NOTE:
Some VHF radios, such as the popular Uniden brand, have input lev- els which require use of an additional diode and resistor built into the M68i data cable. This is Wiring Diagram A, which is described on page 2. The majority of the DSC radios will work with the resistor and diode as provided by Lowrance Electronics.
A few other radio brands (and other electronic devices) that meet the NMEA 0183 standard won't need these adapters and you will have to remove the resistor and diode to make those work. This is Wiring Dia- gram B, which is described on page 3.
Consult your other device's owner’s manual, then read through all of the following instructions before you begin. Use the installation dia-
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