Manual Standard Horizon INTREPID - GX1270S (page 56 of 70) (English)

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page 53 Owner’s Manual GX1270S

9.9.3 Group Call

This feature allows the user to contact a group or vessels capable of using DSC to

automatically switch the radios to a desired working channel for voice communication.

9.9.4 Urgency Call

This call should be used when a vessel may not be truly in distress, but have a

potential problem that might lead to a distress situation.

9.9.5 Safety Call

Used to transmit boating safety information to other vessels. This message usually

contains information about an overdue boat, a derelict afloat, loss of a navigation aid

or an important meteorological message.

9.9.6 Position request

Used to poll another vessel position via DSC and show it on the LCD of the radio.

9.9.7 Telephone Call

Used to automatically place a telephone call through a shore based telephone

company. (In the U.S. market contact maritel at 1866 - marinet for subscription details)

9.10 ADDITIONAL DIGITAL SELECTIVE CALLING

INFORMATION

For additional information the USCG has an excellent site that should be visited at

www.navcen.uscg.mil/marcoms/gmdss/dsc.html

9.11 ABOUT VHF RADIO

The radio frequencies used in the VHF marine band lie between 156 and 158 MHz

with some shore stations available between 161 and 163 MHz. The marine VHF

band provides communications over distances that are essentially “line of sight” (VHF

signals do not travel well through objects such as buildings, hills or trees). Actual

transmission range depends much more on antenna type, gain and height than on

the power output of the transmitter. On a fixed mount 25W radio transmission expected

distances can be greater than 15 miles, for a portable 5W radio transmission the

expected distance can be greater than 5 miles in “line of sight”.

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Standard Horizon INTREPID - GX1270S Manual

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