Lost SOG data on Ray E120w

Henry Boyd

Well-Known Member
Apr 24, 2007
6,014
Newburyport, on the peaceful and serene Merrimack
Boat Info
‘09 Sabre 38 Hardtop Express “Serenity”
Engines
Volvo D6 w/IPS450 Pods
Subject line says it all. Its kind of crazy none of the other GPS related data is missing, like COG and position. The system is a pair of E120W mfds, AIS 650, RM autopilot, RM depth via DSM30, and HD radar. These are all connected via a SeaTalkNG network and patched to a NMEA2000 backbone for engine and tank data from the Volvo EVC. There is also a Garmin 7608 attached to the N2000 network just before we went into storage that has GPS, although it is used exclusively for engine data. In hindsight I should have checked the Garmin for speed info, but didn't.

Does anyone have an idea of what might be the issue? The e120s are set up as master and slave, so I presume the issue could be masked by the fact the slave is displaying data from the master.

More basically what is the source of SOG? Is it in the GPS, or a calculation in the MFD?

Could it be as simple as a software switch setting in the E120?

Thanks
H
 
Ray Marine customer service has been a great resource for me... 800-539-5539
 
Henry, you don't mention your GPS source. Typically, for a E120 install it would be the Raymarine 125 GPS receiver connected to the MFD via NMEA 0183 or Seatalk; dual installations frequently include 2 receivers, one to each MFD. SOG is, I believe, calculated in the GPS receiver and transmitted via the "VMG" NMEA sentence.
Loss of SOG might be an indication of your GPS receiver(s) going bad, not unusual after a number of years. Typically it's the on-board battery (akin to the ROM batteries in older PCs) that fails.
There is also a SOG/COG filter in the 125 to compensate for oscillation based on boat speed. It can be adjusted in the E120 configuration menus.
Your Garmin, I believe, has an on-board GPS receiver that may or may not acquire satellites based on its install location. If it does, it ought to be transmitting that info over your network and being read by the E120's.
 
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Henry, you don't mention your GPS source. Typically, for a E120 install it would be the Raymarine 125 GPS receiver connected to the MFD via NMEA 0183 or Seatalk; dual installations frequently include 2 receivers, one to each MFD. COG is, I believe, calculated in the GPS receiver and transmitted via the "VMG" NMEA sentence.
Loss of COG might be an indication of your GPS receiver(s) going bad, not unusual after a number of years. Typically it's the on-board battery (akin to the ROM batteries in older PCs) that fails.
There is also a COG filter in the 125 to compensate for oscillation based on boat speed. It can be adjusted in the E120 configuration menus.
Your Garmin, I believe, has an on-board GPS receiver that may or may not acquire satellites based on its install location. If it does, it ought to be transmitting that info over your network and being read by the E120's.


It is SOG that is missing. There are multiple gps sources; a 125 that I believe is the “main”, another RM gps source for the AIS transceiver that’s supposed to be dedicated to the AIS, and the Garmin. The Garmin is new, I’m not familiar with it enough to say if the gps data is being output to the network.

The 125 is connected to the n2000/SeatalkNG network. While there are dual displays there really isn’t any true redundancy.
 
It is SOG that is missing. There are multiple gps sources; a 125 that I believe is the “main”, another RM gps source for the AIS transceiver that’s supposed to be dedicated to the AIS, and the Garmin. The Garmin is new, I’m not familiar with it enough to say if the gps data is being output to the network.

The 125 is connected to the n2000/SeatalkNG network. While there are dual displays there really isn’t any true redundancy.
Henry, sorry, I meant SOG where I wrote COG; I edited my post to correct. Both SOG and COG are calculated by the 125 and the filter I mentioned also relates to both parameters. There is a simple status light on the 125 you might want to check if you can get to it.
 
Is the sog reading 0.0 or is the window missing completely?
753834B2-AA59-41C3-9388-93AAB36F7191.jpeg
 
Is the sog reading 0.0 or is the window missing completely?View attachment 75957

joey
It reads 0.00.

Al,
Bad battery in the 125 makes sense considering bad batteries were a common cause of failure on the predecessor 120. If that’s the case a new gps is on the shopping list. I’m assuming that since these are nmea2000 devices at least the replacement installation will be easy.

H
 

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