Raymarine Echostar 790 Specifications Page 42

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STANDARD HORIZON VM-3500E
Fixed DSC VHF Radio
Rugged submersible DSC VHF radio. Features oversized knobs for easy adjusting of Volume, Squelch, channel
changing and moving through radio and Digital Selective Calling functions. The 560mm internal speaker is
loud enough to be heard over engine and background noise.
The large display can display channel names, DSC call information and GPS position with Speed Over Ground
and Course Over Ground. The radio also has the capability to poll and display another vessel’s position on the
VHF display, or also on the display of any current Standard Horizon chartplotter.
It can be connected to a CMP25B which operates as a fully functional second station and intercom. The
VM-3500E also has a 30W loud hailer with 4 pre-programmed fog signals and listen back.
ALSO CONSIDER
Icom M601
Raymarine Ray240E
Simrad RS86/RS87
KEY FEATURES
Submersible (IPX7 front panel)
Independent Ch70 receiver for continuous DSC
monitoring
Large illuminated alphanumeric display and keypad
Fistmic with channel selection and Ch16/Ch9 keys
Channel name display (12 character)
Versatile user programmable scanning, priority scan
and Dual Watch
Single button Ch16 and Ch9 access
Voice scrambler option
OORRDDEERR CCOODDEE VVMM--33550000EE -- ZZSSTTAAVVMM--33550000EE
OORRDDEERR CCOODDEE CCMMPP2255BB -- ZZSSTTAACCMMBB2255BB
STANDARD HORIZON HX270E
Waterproof Handheld VHF Radio
This compact, rugged submersible handheld VHF features all International, USA
and Canadian channels and a highly legible LCD display with an automatic
backlight. The preset key allows you to recall the 8 most frequently used
channels. Standard Horizon are so confident of the HX270E’s waterproof
integrity and reliability that they are offering a three year no quibble free of
charge “repair or replace” guarantee if it fails for any reason during that period.
KEY FEATURES
Large, clear backlit display
Dual Watch
Submersible
Battery charge level indicator
1400mAh NiMH battery provides
a 16-hour duty cycle between charges
Standard three year guarantee
SUPPLIED WITH
Alkaline battery tray, 1400mAh NiMH battery pack, 12v overnight
charger, mains adaptor and belt clip
Standard Horizon
VHF Radios
We accept most major credit and debit cards
42
Geographic Datums and
Electronic Charts
Geographic datum is a frame of reference used
by cartographers to define a chart's grid of coor-
dinates. The datum can have a significant impact
on navigational accuracy.
A chart is really a "projection", converting the
earth’s spherical surface to a flat drawing. Most
charts are drawn to a Mercator projection, on
which latitude and longitude lines are parallel.
The cartographer's job is complicated in that the
earth's surface is actually an irregular ellipsoid
which is larger in diameter at the equator than at
the poles. For that reason, cartographers have
developed datums to approximate this shape.
These models must also reflect the local varia-
tions caused by the irregular surface of the earth.
Through the centuries, cartographers have used
a variety of datums to create charts and maps.
This usually doesn’t pose a problem, as long as
all of the charts of a given area use the same
datum - there are scores of such regional
datums. In recent times the geographic commu-
nity has attempted to develop standardised
worldwide datums to provide a universal system
of coordinates. These datums have been refined
as cartography has improved.
In the USA, NOAA has been gradually transition-
ing from the old North American Datum 1927
(NAD 27) to the newer World Geodetic System
1984 (WGS84). Differences between the two
may range from 40 metres in Florida to 150
metres in Maine. In other parts of the world,
charts are based on other formats such as
WGS72 or regional datums. GPS uses WGS84 as
its global reference.
Why is the correct Chart Datum important?
Matching the GPS and chartplotter to the datum
used in the chart card will ensure that your posi-
tion is shown correctly on the chartplotter screen.
Otherwise your boat's position may be shown up
to several hundred metres away from where it
actually is.
Find out more...
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STANDARD HORIZON CMP25B
RAM+ Second Station Microphone
This advanced remote has an
oversized LCD display and
backlit keys. It operates as a
second station to the VM-3500E
allowing full control of the VHF
at the flybridge, in
the cockpit, tower or
location of your
choice.
KEY FEATURES
Large, clear backlit display
Submersible
Remotely control all VHF functions including PA,
foghorn and Digital Selective Calling
Inbuilt distress alert button
Display shows channel names and
repeats GPS information
SUPPLIED WITH
Bulkhead socket assembly, mounting clip
OORRDDEERR CCOODDEE -- ZZSSTTAARRAAMM++
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OUR VERDICT
This is a popular, competitively priced handheld VHF built to a
very high standard. Its rugged design, large display and features
make it one of our recommended buys.
OORRDDEERR CCOODDEE -- ZZSSTTAAHHXX227700EE
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