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Standard Horizon HX751E Manual

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HX751EPage 6
3. ABOUT THIS RADIO
3.1 ABOUT THE VHF MARINE BAND
WARNING
The radio frequencies used in the VHF marine band lie between 156
and 158 MHz. The marine VHF band provides communications over
distances that are essentially “Line of sight” Actual transmission range
depends much more on antenna type, gain and height than on the power
output of the transmitter. On a fixed mount 25 W radio transmission
expected distances can be greater than 15 miles, for a portable 6 W
radio transmission the expected distance can be greater than 5 miles in
“Line of sight”.
The user of a Marine VHF radio is subject to severe fines if the radio is
used on land. The reasoning for this is you may be near an inland water-
way, or propagation anomalies may cause your transmission to be heard
in a waterway. If this occurs, depending upon the marine VHF channel
on which you are transmitting, you could interfere with a search and
rescue case, or contribute to a collision between passing ships. For
channel assignments refer to page 35 section 11.
3.2 EMERGENCY
(
CHANNEL 16 USE
)
Channel 16 is known is the International Distress and Calling Channel. An emer-
gency may be defined as a threat to life or property. In such instances, be sure
the transceiver is on and set to CHANNEL 16. Then use the following procedure:
1. Press the PTT (Push-To-Talk) switch and say “Mayday, Mayday, Mayday.
This is _____, _____, _____” (your vessel’s name).
2. Then repeat once: “Mayday, _____” (your vessel’s name).
3. Now report your position in latitude/longitude, or by giving a true or mag-
netic bearing (state which) to a well-known landmark such as a navigation
aid or geographic feature such as an island or harbor entry.
4. Explain the nature of your distress (sinking, collision, aground, fire, heart
attack, life-threatening injury, etc.).
5. State the kind of assistance your desire (pumps, medical aid, etc.).
6. Report the number of persons aboard and condition of any injured.
7. Estimate the present seaworthiness and condition of your vessel.
8. Give your vessel’s description: length, design (power or sail), color and minute.
9. End the message by saying “OVER”. Release the PTT switch and listen.
10. If there is no answer, repeat the above procedure. If there is still no re-
sponse, try another channel.
… 6 …


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