On Sat, 31 Jan 2004 00:20:05 +0100, "Meindert Sprang"
wrote:


The figures I qouted were for radiated emission, which is hardly present on
lower frequencies. Below 30MHz, conducted emission is more the problem. This
is emission through connected wires and is measured with a current probe
setup.

Meindert

The radiation from the unshielded wires, with many of them sucking
noise from inside the shielded pair because you must hook one side
(NMEA B) to many grounds creating a giant HF antenna out of your
carefully shielded cabling, is the problem on the HF receivers......

Let's just dump all this NMEA crap from 1970 and build Bluetooth
compatibility into every new marine electronic gadget. No need for
multiplexers for ancient technology mistakes, wires radiating crap to
all the radios, wires picking up the 150 watt SSB transmitter and
trashing all the NMEA crap it's hooked to.

I was for USB until I got looking at Bluetooth......

http://www.bluetooth.com/news/index....PID=1130&ARC=1

"NAVMAN GPS 4460 LEADS THE WAY FOR PALM OS 5 USERS

Navigation Leader Unveils New palmOne Handheld Compatible Bluetooth
GPS Device

Foothill Ranch, Calif. – Navman, a leading designer and manufacturer
of world-class global positioning systems (GPS), communication and
marine products, announced today the latest addition to its innovative
line of GPS products for the consumer electronics market. The Navman
4460 is a voice-enabled, Bluetooth™ GPS receiver designed for Palm®OS
5-based handhelds (e.g. select devices from PalmOne, Inc. and Sony).
The device is powered by the latest version of Navman’s award winning
SmartST™ Professional navigation software and offers consumers the
most comprehensive self-contained guidance solution on the market. The
GPS 4460 is being unveiled at the 2004 International Consumer
Electronics Show.

SmartST Version II provides detailed street-level mapping for all of
North America, including Hawaii and Canada. The software is fully
automatic and provides voice (male or female) guidance, in addition to
visual driving instructions. Features include address-to-address
routing, Back-on-track? rerouting when off-course and an extensive
points-of-interest (POI) library. The POI database contains: retail
shops, entertainment venues, local amenities, restaurants, bars,
buildings and monuments, hotels, public transportation, gas stations,
garages, sports facilities, institutions, medical services and natural
attractions, allowing users to plan routes more easily and
effectively. SmartST options provide the ability to find the shortest
or quickest route to any destination, set locations as favorites,
select from a list of recent address entries, and hear spoken
instructions in one of seven languages. Large display icons and
easy-to-read maps provide an operator-friendly interface for added
safety while driving. SmartST is also optimized for palmOne’s new
Tungsten™ T3 handheld, allowing users to take advantage of the
device’s full 320x480 screen in both portrait and landscape modes.

The 4460 device employs a high-performance GPS receiver combined with
an embedded, Class 2 Bluetooth transceiver, which facilitates the
wireless communication of accurate satellite navigation information to
the handheld device. Once the SmartST software is installed onto the
user’s computer, it can be downloaded to the PDA via synchronization,
and map, voice and POI data is stored on an SD Card. A blinking LED
displays connectivity status and low battery indication. The complete
GPS 4460 solution includes a wireless GPS antenna, SmartST
Professional navigation software, a vehicle power adapter, vehicle
mounting brackets, and both an armband and lanyard for outdoor
personal use. The unit operates for 30 hours on 3 AAA Alkaline
batteries (included)."

Isn't it time to DUMP NMEA-XXXX and move all boat instruments on to
wireless technology?

Yes, it is.....



Larry W4CSC

No, no, Scotty! I said, "Beam me a wrench.", not a WENCH!
Kirk Out.....