ICOM 322800 사용자 설명서
About calculating position
The GPS receiver acquires signals from GPS
satellites. It calculates its position by the orbit
information of the GPS satellites and needs to
measure the distance between itself and three
or more GPS satellites to obtain a reliable posi-
tion. The GPS receiver acquires all available
satellites when it is first powered up, powered off
for a long time, or powered up again at a place
a long way from when it was last powered off.
Normally, it takes approximately 1 minute for de-
termining a position.
satellites. It calculates its position by the orbit
information of the GPS satellites and needs to
measure the distance between itself and three
or more GPS satellites to obtain a reliable posi-
tion. The GPS receiver acquires all available
satellites when it is first powered up, powered off
for a long time, or powered up again at a place
a long way from when it was last powered off.
Normally, it takes approximately 1 minute for de-
termining a position.
In places where the GPS signals cannot reach
the GPS receiver, such as around tall buildings,
it may show position errors (misplacement) or
no position reading at all.
the GPS receiver, such as around tall buildings,
it may show position errors (misplacement) or
no position reading at all.
As the satellites are continuously moving, mea-
surement of the position or time by the GPS
receiver may take a while, and/or no position
reading can be made in some instances. Even if
the GPS receiver acquires signals from three or
more GPS satellites, it may take a longer time to
determine a position depending on the satellite
locations.
surement of the position or time by the GPS
receiver may take a while, and/or no position
reading can be made in some instances. Even if
the GPS receiver acquires signals from three or
more GPS satellites, it may take a longer time to
determine a position depending on the satellite
locations.
About Almanac and Ephemeris Data
To reduce the time for calculating position, the
GPS receiver stores the Almanac Data (the orbit
course/orbital parameters of the satellites) in its
internal memory. When the GPS receiver is left
with the power OFF for a long time, it needs to
acquire the Almanac Data again. In this case,
the GPS receiver starts as a “cold” start.
GPS receiver stores the Almanac Data (the orbit
course/orbital parameters of the satellites) in its
internal memory. When the GPS receiver is left
with the power OFF for a long time, it needs to
acquire the Almanac Data again. In this case,
the GPS receiver starts as a “cold” start.
The GPS receiver stores Ephemeris Data of the
satellite’s orbital course, and refers to this data
when it is turned OFF for a short time.
satellite’s orbital course, and refers to this data
when it is turned OFF for a short time.
This is called a “hot” start, and uses the Ephem-
eris Data that is valid to within less than 4 hours.
eris Data that is valid to within less than 4 hours.
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan.
A-6747H-1EX-
q
Printed in Japan
© 2009–2010 Icom Inc.
Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United
States, United Kingdom, Germany, France, Spain, Russia and/or other countries.
MarineCommander is a trademark of Icom Incorporated.
States, United Kingdom, Germany, France, Spain, Russia and/or other countries.
MarineCommander is a trademark of Icom Incorporated.
ATTENTION
MOUNTING
Location precision
The GPS receiver automatically calculates its
position when it acquires signals from three or
more GPS satellites.
position when it acquires signals from three or
more GPS satellites.
The GPS satellite’s measurement error is about
±10 meters, however this can vary up to several
hundred meters depending on the surrounding
environment.
±10 meters, however this can vary up to several
hundred meters depending on the surrounding
environment.
When the GPS receiver is powered up again at
a place a long way from when it was last pow-
ered off, the first calculation of its position may
be incorrect in some cases.
a place a long way from when it was last pow-
ered off, the first calculation of its position may
be incorrect in some cases.
The GPS information and its accuracy varies,
depending on the GPS system being acquired,
place and time.
depending on the GPS system being acquired,
place and time.
About NMEA sentence
At times, the current position data cannot be
received due to the GPS signal being blocked by
something, or it takes a long time to acquire the
position data from a cold start. In those cases,
the GPS receiver sends the last memorized
NMEA sentence, but the sentence may also in-
clude invalid data.
received due to the GPS signal being blocked by
something, or it takes a long time to acquire the
position data from a cold start. In those cases,
the GPS receiver sends the last memorized
NMEA sentence, but the sentence may also in-
clude invalid data.
ï
Mounting locations
The GPS receiver should be mounted in a
location that has a clear, unobstructed view
in all directions and as far away from interfer-
ence as possible, for the best reception. When
selecting a mounting location, follow the guide-
lines below.
location that has a clear, unobstructed view
in all directions and as far away from interfer-
ence as possible, for the best reception. When
selecting a mounting location, follow the guide-
lines below.
- The location should be at least 1 m (3.28 ft.)
away from a VHF/UHF antenna, and 4 m
(13.12 ft.) away from a MF/HF antenna.
(13.12 ft.) away from a MF/HF antenna.
- The location should be at least 5 m (16.40 ft.)
away from an Inmarsat antenna.
- Be sure the location is out of the radar beam.
- Be sure the location will not be shaded by a
random antenna or mast.
- Mount the GPS receiver as high as possible.
We recommend that you place the GPS receiv-
er in the desired location temporarily, and see
if it receives any interference.
er in the desired location temporarily, and see
if it receives any interference.
ï
Installation
The supplied extension pipe is to be inserted
firmly into the base of the GPS receiver and
screwed in a clockwise direction.
firmly into the base of the GPS receiver and
screwed in a clockwise direction.
Using the supplied hose clamps, the GPS
receiver can be stabilized to the mounting mast.
receiver can be stabilized to the mounting mast.
Prior to any operation, it is important to make
sure that all connections are made accurately.
All connections should be made only by certi-
fied persons.
sure that all connections are made accurately.
All connections should be made only by certi-
fied persons.
The output connector is to be connected from
the GPS receiver to the GPS data input terminal
of the MarineCommander
the GPS receiver to the GPS data input terminal
of the MarineCommander
™
.
CONNECTION
Hose clamps
(Supplied)
(Supplied)
MarineCommander
™
MXP-5000
MXG-5000
[GPS]