Connect The Radio Cables - NorthStar EXPLORER 721EU Operation And Installation Manual

7-8 Connect the Radio Cables

The connectors are on the rear of the base unit, as follows:
1. GPS and COM connector. For connection to GPS device via NMEA. Also includes NavBus wiring for Track
Buddy and other features. See the following table for wiring and color codes. (If you're not using this, be
sure to put the protective cap securely over the connector to protect it from moisture and dust.)
2. Docking Cable connector (Explorer 721US/EU only) for optional Handset. Plug the docking cable jack
into the connector. (If you're not using this, be sure to put the protective cap securely over the connector
to protect it from moisture and dust.)
3. External Speaker connector. Plug the external speaker cable jack into the connector BEFORE powering
on the radio. Use a 4 Ohm 4 Watt external speaker.
4. RED Power wire. Connect this to the POSITIVE (+) battery terminal. Check that a 10 Amp fuse is installed
on this power cable close to the battery.
5. BLACK Power wire. Connect this to the NEGATIVE (-) battery terminal.
6. ANT. A radio antenna is not supplied. A suitable radio antenna must be mounted and connected before
operating the Explorer 721/725 radio. Consult your dealer for advice if necessary.
7. GND. A ground connection is not usually required..
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Northstar Explorer VHF Series: 721/725 Operation and Installation Manual
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