MFD and charts

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   This is mostly a FYI post.This is a heads up to all of you with multiple MFD,and I did not find any posts on this issue.
We have 3 MFD's on boat....one at chart table and two at the pods.As we returned to boat in august, when turning on MFD's,the navionic charts were not displaying on the 2 pods(the card is on the master/chart table).After multiple re-boot of the mfd at the pod, charts appeared and all was good until shut down.Daily,we had to go through re-boot process.

The radar was functioning on all 3 MFD,therefore should not be NEP,the Ethernet communication was functioning ........and after multiple hours of diagnosis ,NEP was changed to no avail.

All 3 MFD's had the latest update.

B&G's before last recommendation was a master reset.........no changes.

Finally,a wise (3 rd different technician),decided to try with a new Navionic card.......wich solved the problem.

Therefore,not sure why a sd card wich functions in the MFD in wich is inserted, but only communicates intermittently with slave MFD is defective but be aware.

A simple fix, but be aware that those SD cards can partially fail

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Nelson01 Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Commander Joined: 18 September 2018 Location: Med...Italy now Status: Offline Points: 58	Post Options Post Reply Quote Nelson01 Report Post Thanks(0) Quote Reply Topic: MFD and charts Posted: 02 October 2025 at 07:24
	This is mostly a FYI post.This is a heads up to all of you with multiple MFD,and I did not find any posts on this issue. We have 3 MFD's on boat....one at chart table and two at the pods.As we returned to boat in august, when turning on MFD's,the navionic charts were not displaying on the 2 pods(the card is on the master/chart table).After multiple re-boot of the mfd at the pod, charts appeared and all was good until shut down.Daily,we had to go through re-boot process. The radar was functioning on all 3 MFD,therefore should not be NEP,the Ethernet communication was functioning ........and after multiple hours of diagnosis ,NEP was changed to no avail. All 3 MFD's had the latest update. B&G's before last recommendation was a master reset.........no changes. Finally,a wise (3 rd different technician),decided to try with a new Navionic card.......wich solved the problem. Therefore,not sure why a sd card wich functions in the MFD in wich is inserted, but only communicates intermittently with slave MFD is defective but be aware. A simple fix, but be aware that those SD cards can partially fail
	Marc H508#11 UNEVIE

Lyn Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 04 February 2022 Location: Hampton, VA Status: Offline Points: 190	Post Options Post Reply Quote Lyn Report Post Thanks(0) Quote Reply Posted: 02 October 2025 at 13:04
	I have a similar setup (2 helm station MFDs & 1 in the saloon) and experienced a similar event in July. Normally, I keep the card in the saloon MFD and it broadcasts the detailed charts & depths to the helm locations. As I understand it from my search for causes, the MFDs communicate via an ethernet hub that must be hidden and isn't clear to me which circuit powers it. That day, the depths & details weren't showing at the helm. Powering the saloon MFD off & back on didn't cure the problem. I turned off & on the circuits (CZONE) on my boat associated with the MFDs, autopilot, radar, etc. I moved the card to one of the helm locations, and it broadcast it to the other helm station but not the saloon. I could sail. So, I figured something must have disrupted the communication path from the saloon MFD to the hub. Except upon my next trip to the boat, it worked again and I was able to move the card back below. The key difference being that in "Dock Unattended" nearly switchable circuit is turned off. Perhaps I wasn't cycling power to the ethernet hub.
	Jon S/V Lyn 2017 Hanse 588 \| Hull 19 \| Deep draft \| 150hp \| 220v & 110v systems \| Lithium House Bank

Wayne's World Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 18 July 2012 Location: Cruising Status: Offline Points: 1434	Post Options Post Reply Quote Wayne's World Report Post Thanks(0) Quote Reply Posted: 02 October 2025 at 22:54
	We occasionally have a situation where one of our 3 MFD doesn't get the chart data. Sometimes both the helm MFDs don't get the chart data. But the nav station MFD always has the full data. Our fix so far has been to do a shutdown of all MFDs the turn off the power to all nav equipment at the 12V panel, wait for 1-2 minutes then turn the power back and and power up each MFD and this normally fixes the problem for several months. We live on board and always leave at least the nav station MFD on and often the STBD side helm MFD so the system does not get completely turned off all that often.
	Wayne W Cruising, currently in the Pacific until the end of 2026.



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