I'm looking for a sonar that will send NMEA depth data out and receive NMEA GPS data in. I also want a unit that works with the 4pin CV20-TM transducer. According to the installation and user manuals (page 4 of http://static.garmin.com/pumac/echoM...llation_EN.pdf ), the EchoMap Plus 45cv is exactly what I'm looking for. Can anyone confirm that it will work with an external GPS? Will it also send NMEA depth data?
just curios but what is nmea depth.? What transducer does it use.?
Here's a snippet from the ECHOMAP 40 series installation manual. According to this manual, the ECHOMAP 40 series transmits "SDDBT" and "SDDPT" sentences (depth and depth below the transducer). It doesn't appear to support receiving GPS data ("GPGLL" and "GPRMC").Originally Posted by rocket man
The transducer I want to use is the 4 pin CV20-TM ( https://buy.garmin.com/en-US/US/p/614242#accessories ) which is available bundled with this plotter.
I consulted with the echoMAP engineer regarding your NMEA0183 questions. His response is below. Report back with any issues.
Yes, the echoMAP family will take in NMEA0183 GPS data as well as output depth under transducer, which I believe is SDDPT. The user will have to perform some setup steps in the Home->Settings->Communication menu.
Most likely they will need to make these adjustments:
Change the type to NMEA standard
enable the SDDPT output in the NMEA setup control under Sounder
ensure the external GPS source is the preferred source for GPS, instead of AUTO or Internal.
The changes might not be limited to these, these are off the top of my head.
Garmin Pro Team
Awesome Todd, thank you very much!
You guys got me lost on how nmea can pick up depth. Who wants to explain it to me.?
NMEA 0183 is a serial communications standard and has been around for about as long as marine electronics have existed. It uses standard text "sentences", sent and received via a serial port (RS232 or 422), to share information between different marine electronics.
@Todd - So, as far as NMEA 0183 transmit / receive is concerned, are the EchoMap Chirp and EchoMap Plus the same? On paper it appears they are.
This has been an interesting read for me. The installation manual specifically identifies the brown/blue wires in the power cluster as NMEA0183. All along I thought that the mysterious Garmin High Speed Protocol was different. Now they look to be the same protocol. My chirp 93sv has a NMEA2000 connector on the back, but in the power cluster has two extra wires identified in the installation manual as NMEA0183. So yes. On paper they look to be identical. I've not tried any of it though. I use NMEA2000 with the backbone and T's.
The brown/blue wire color makes it confusing though. We've been told repeatedly that Garmin High Speed Protocol is limited to 2 devices. You could write a book about what I don't know about this.
Last edited by LWINCHESTER2; 01-16-2018 at 10:31 PM.
My wife asks if I'm going to fish every day. I can't fish every day. Some days I might be sick.
NMEA 0183 is an old standard, supported by a wide variety of hardware and software, and is easy to decypher and interface with. NMEA 2000 is a whole 'nother critter and, to be honest, I don't really know too much about it except it allows easier connections between senders / receivers.
I think I understand now. It actually isn't reading depth it is receiving it from another source. Correct?
Without digging into the code, the engineer was pretty sure they are the same.
Garmin Pro Team
Thanks Todd!
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