Amen.
I have two Garmin's, two VHF radios and a radar. I had to email Garmin for
assistance in wiring for each of them. The good news is that Garmin is quick
to answer email.
I not only told them what equipment I was connecting, but quoted the
manufacturer's instructions, because they don't all use the same
terminology.
Remember to set the Garmin for NMEA/NMEA, and maybe not the fastest speed.
I found that my radar doesn't seem to detect the information at the fastest
speed, but is OK at slower BAUD speeds.
If it's a new Garmin, you may have to manually initialize it. When I travel,
my Garmin sometimes takes a long time to figure out where it is, so I
manually initialize it for the new location.

"Gordon Wedman" wrote in message
newsK%Of.15853$vC4.7665@clgrps12...

"speckfisher" wrote in message
...

I have a new Icom M422 VHF and am trying to connect with a Garmin 182
GPS for the DSC function. I have contacted tech service both Icom and
Garmin and it seems to be properly connected and all of the settings
properly set. I only get a "NO POSITION" reading on my vhf when I go to
ck it . I left it on for about an hour to see if it need time to
initialize but still didn't work . Could it be that somehow they are
incompatible with each other ? How can I check that? Also is it
possible to check to see if the NMEA in/out are working on both sets?
Any help would be appreciated


--
speckfisher

I just hooked up my JRC Nav 500 GPS to my Standard Horizon VHF. I pushed
the Nav button on the VHF and there was my position, speed, bearing and
date/time. Shouldn't need any sort of initialization and I would not
think the Garmin and Icom would be incompatible.
I find the designations used by the various manufacturers for NMEA data in
/ data out to be confusing. You never know if two different manufacturers
are describing things the same way. Its possible you just have the wires
hooked up wrong.
On my setup the GPS had DataOut + and DataIn +. These were the only two
wires I hooked up to the NMEA In / NMEA Out wires on the VHF.

The only other thing I can think of is matching the NMEA output speed from
the Garmin to whatever is spec'd for the VHF.

As for checking for a NMEA data stream, you can do this using a laptop
computer by using Terminal mode. Once again you will be faced with
connecting the correct GPS wires to the correct wires on a serial plug
that goes to the laptop. The manual for your Garmin should tell you which
NMEA strings it outputs. If the GPS is working its likely the NMEA output
is working so I'd concentrate on the connections to the radio.
Good luck.