How The Microphone And Optional Handset Work Together - NorthStar VHF Marine Radio Explorer 721EU Operation And Installation Manual

A typical operational display on base unit LCD:
A typical operational display on Optional Handset LCD:

1-6 How the Microphone and Optional Handset Work Together

If you have the optional handset installed, as well as the microphone:
• neither item works when both are ON hook, but you can hear the audio from the handset
speaker and adjust the handset volume.
• to use one item when it's OFF hook, the other item must be ON hook.
• if both items are OFF hook, only the microphone works.
• in Intercom mode ONLY, both items work OFF hook.
Baro Graph. A histogram of barometric pressure readings over the past 24 hours.
The high-resolution histogram centers automatically if the range goes off scale.
Readouts are taken even when the engine and radio have been powered down
(with typically less than 3mA of current drain).
Northstar Explorer VHF Series: 721US, 721EU Operation and Installation Manual
A transmission on Channel 16 is being
made at high power using the International
channel bank.
Channel 16 is set as the Priority channel.
There is an incoming DSC DISTRESS call so
the receiver is busy.
The latitude and longitude of the vessel
and UTC time are shown.
3 bars by the Happy Fish indicates rising
barometic trends and reasonable fishing
conditions.
The weather indicates showery conditions.
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