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  Using GPS 19x NMEA 2000 with non-Garmin Devices

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Author Topic:   Using GPS 19x NMEA 2000 with non-Garmin Devices
jimh posted 10-26-2012 02:08 PM ET (US)   Profile for jimh   Send Email to jimh  
I recently became aware of the Garmin model GPS 19x NMEA 2000 GNSS receiver. It looks like the most advanced NMEA-2000 GNSS receiver available at the present time. The advantages of the GPS 19x NMEA 2000 compared to other devices are along two lines:

--the GPS 19x NMEA 2000 is a true GNSS receiver and can work with GPS and GLONASS (as well as other planned systems), compared to most competitors' devices which are strictly GPS-only; and

--the GPS 19x NMEA 2000 provides an extremely high rate of position refresh, ten times per second (10-Hz), compared to most competitor devices which are typically only 1-Hz or perhaps 5-Hz at best.

The advantage of using GLONASS and GPS is an opportunity for better position solutions; the more satellites available the more likely the position solution will be accurate. I believe this benefit is obtained by selecting the best set of pseudo-ranges to give the lowest HDOP factor. (Feel free to comment further on that topic.)

The advantage of a higher rate of position refresh is claimed to give an advantage at low speed of movement. This seems paradoxical, but everyone seems to agree: at low speed of movement a faster position update improves accuracy. (I don't really know how that works, so if someone does, feel free to explain.)

The cost of the GPS 19x NMEA 2000 is not out of line with other choices. For example, Lowrance offers the LGC-4000 for about the same price. The LGC-4000 is GPS-only and has a 5-Hz update. Now we come to the $64,000-question:

How will the GPS 19x NMEA 2000 interoperate with non-Garmin devices on a NMEA-2000 network, specifically with regard to the 10-Hz update rate. Will non-Garmin chart plotters, say a Lowrance HDS-8 Gen 1, be able to take advantage of a 10-Hz position update? Or, is 10-Hz too much for them?

Any first-hand experience with the GPS 19x NMEA 2000 would be great to hear about.

bluewaterpirate posted 10-31-2012 11:57 AM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
The GPX 19 will be displayed on the list of N2k devices of the Simrad or Lowrance MFD but will not provide usable positional data standalone. If the GPX 19 is connected to a compatible Garmin MFD then the positional data will be availbale to the dissimiliar units as passed via the Garmin MFD unit. The postiion data will reflect the Garmin MFD that it's coming from (i.e. 4000/5000/6000/7000 series).

http://i676.photobucket.com/albums/vv129/bluewaterpirate/ Simrad%20NSS8%20Collage/shot18.png

Here's a list of Garmin N2k devices listed by my NSS8

Note: The GPX 19 is not compatible with all the Garmin GPS/MFDs.

https://buy.garmin.com/shop/shop.do?cID=288&pID=100686

Tom

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