ICOM no position or time after AIS install

[CaptSJD]

I’ve got a 2025 R27, and my dealer recently installed a Garmin AIS 800 Transceiver. They also upgraded the antenna to an 8’ Shakespeare VHF/AIS dual-tuned model and added a Garmin GMS 10 Network Expander, possibly tied to the Garmin TD50 they installed at the same time.

The boat originally came with an ICOM IC-M330 VHF. Since the AIS install, though, the ICOM no longer displays GPS position or time. I asked the dealer about it, and they said it couldn’t be done — but that doesn’t sound right to me.

I’m wondering if the GPS data that used to feed the ICOM is no longer being passed through the NMEA network after the AIS was added. I’m constantly getting “no position” alerts on the radio, and I’d really like to get that working again.

Anyone run into something similar or know what might have changed in the wiring/network setup?

Thanks!

 

[Submariner]

Sounds like they disconnected the ICOM radio from the Nema2k backbone (how it would get GPS position data and time) and probably used that Nema2k T for the Garmin 800.

When I do AIS isntalls, Autoglides installs, etc... I often have to replace a couple single Nema2kT's with a multi-port (4 port) T to make the extra space. A 4 port T takes up the space of about 2.5 of the single T's. I have photos of this on our website.

I have installed a Garmin 800 AIS transponders into a 2025 R27, and their ICOM radio configured to function as expected. I would argue, it's important that the VHF radio receive GPS and time, else the DSC distress button, which is a key safety item on the boat, wouldn't work since the radio wouldn't know it's GPS position.

Nema2k Upgrade

IMG_7784.jpeg | Boat-Upgrades {Upgrade Name}

Replace 3 Nema2K T's with a single Multi-T (4 port) to add Lenco Autoglide. (or AIS).

www.letsgochannelsurfing.com

Space is at a premium... with everything I've added to Channel Surfing, I've got two of those multi-port (4 port) T's installed, with single T's on both ends.

 

[Full_O_Fish]

Ic-M330 only has nmea0183 connection for position data. This would have been supplied by the pwr/data cable from your MFD. Garmin requires the nmea0183 "data ports" be configured in order for the MFD to output the correct data sentences and at the correct speed (4800 or 38400 baud). If they reset your MFD to factory settings after a software update, these settings will likely need to be changed back in order to provide the VHF with position data once again.

Although more involved, the other (and quite frankly better) option would be to rewire the VHF and connect it to the nmea0183 output of the AIS800 unit. This way if the AIS unit is tied to a ~24hr power source as most are, the VHF will have access to position data all the time without relying on having the MFD(s) and/or nmea2000 network turned on.

 

[CaptSJD]

Sounds like they disconnected the ICOM radio from the Nema2k backbone (how it would get GPS position data and time) and probably used that Nema2k T for the Garmin 800.

When I do AIS isntalls, Autoglides installs, etc... I often have to replace a couple single Nema2kT's with a multi-port (4 port) T to make the extra space. A 4 port T takes up the space of about 2.5 of the single T's. I have photos of this on our website.

I have installed a Garmin 800 AIS transponders into a 2025 R27, and their ICOM radio configured to function as expected. I would argue, it's important that the VHF radio receive GPS and time, else the DSC distress button, which is a key safety item on the boat, wouldn't work since the radio wouldn't know it's GPS position.

Nema2k Upgrade

IMG_7784.jpeg | Boat-Upgrades {Upgrade Name}

Replace 3 Nema2K T's with a single Multi-T (4 port) to add Lenco Autoglide. (or AIS).

www.letsgochannelsurfing.com

Space is at a premium... with everything I've added to Channel Surfing, I've got two of those multi-port (4 port) T's installed, with single T's on both ends.

Did the Icom radio have the nema0183 connection like mine does?