Over the Horizon AIS suddenly stopped or targets disappeared
Most likely, your chart plotter is filtering out far-range targets it determines as unimportant or of lesser importance when overwhelmed by targets to avoid CPU or display overload. Raymarine and many other chartplotters apply automatic filters after a few minutes after the initial target load.
Older chartplotters may struggle to load and track hundreds of AIS targets because they were designed to expect this volume, e.g. we received a report of a Furuno MFD that could not display more than 100 AIS targets. Garmin devices and the Navionics App have also been reported to display only up to 75 miles of AIS targets.
If you restart your Chartplotter and don't see any Over the Horizon targets load again after 5-10 minutes, please check the following:
Your GPS Status is Active, i.e. the DataHub GPS is connected, or your boat GPS is powered on to provide a location.
Did you change your PredictWind Forecast Account password? If you recently updated your password, please update it in the DataHub, then Save & Apply.
In the NMEA menu, please click the top menu Syslog tab. If the AIS Target refresh shows the status: "Success", it is working. Check the number of vessels downloaded, as this will indicate how many targets the DataHub is receiving before filtering to publish the unique targets only onto the N2K network.
If you see many vessels in the feed (hundreds+), try reducing the Target Age from 45m to 5 or 10m and reducing your Range to 25 miles or less. Next, please turn off your Chartplotter, wait around 5 minutes and turn it on again.
Duplicate VHF and Over the Horizon AIS Targets appear on my chartplotter or App
The DataHub filters out targets published by a VHF AIS transponder onto the N2K network already and does not publish them again with Over the Horizon targets reported. If you have connected your VHF AIS directly to your chartplotter or laptop App, and added the NMEA2000 or 0183 feed from the DataHub, duplicates will appear because the sources independently provide the same information.
If you have connected your VHF AIS to the NMEA2000 network and are still seeing duplicates, please check it outputs AIS targets onto the network, as some AIS transponders only send/recieve GPS position via N2K. Please also allow time for the DataHub exclusion filtering list to build up and for any duplicate targets appearing on your chartplotter to expire.
To resolve this issue, power off the AIS transponder, chartplotter and DataHub and close any App you are using. Then please:
Power on the AIS transponder and allow 5-10 minutes to acquire all local targets.
Power on the DataHub and wait 10-15 minutes for it to boot up, connect, download Over the Horizon AIS and build an exclusion list from targets on the N2K network.
After 10-15 minutes, power on your Chartplotter.
This ensures the Chartplotter's initial data load is only VHF AIS targets and Over the Horizon targets, excluding those the DataHub has filtered out. If you continue to experience duplicates after this restart process, please contact support including details of all your devices, their model numbers and how they are connected.
My vessel appears as a ghost AIS target ~20m behind me. This is setting off proximity alerts, why?
We have received reports of some AIS transponders, notably Vesper, experiencing this. The AIS transponder does not publish an AIS target of your vessel into the N2K network, so the DataHub cannot filter it out before publishing Over the Horizon targets.
Please contact Support with your VHF AIS transponder model, MMSI and DataHub Serial number, which can be found under Services->Tracking. We can provide you with a unique key and steps to activate a fix for this.
My RayMarine Chartplotter displays AIS Target names with diamond question marks
We have received reports of Raymarine Axiom series Chartplotters displaying diamond-shaped question marks at the end of the target name. This issue has been fixed in DataHub Firmware version 4.06.
To install Firmware version 4.06:
Click Services->Settings->Software Updates.
Click Alternative.
On the Alternative list, select HUB-32m-v.4.06.bin.
Click Download and install the Firmware.
Please ensure the DataHub remains powered on during the Firmware update, which may take up to 15 minutes.
After 10 minutes, please reconnect your phone, tablet, or laptop to DataHub Wi-Fi and check the Firmware version in the bottom right corner is 4.06.
