No ADS-B time reference available

Hi all - Brand new to sending data to FR24, utilising an old Rasp' Pi, I used the FR24 build and it seems to be working OK, server is showing online and receiving data. I've done a heap of searching and can't seem to find anything conclusive about the MLAT error 'No ADS-B time reference available'. Can someone just confirm I have my understanding right:

I'm not getting a time reference because there are no MLAT receivers in my local area to allow for triangulation and this isn't a configuration error ?


2017-01-12 21:11:05 | [feed][n]working
2017-01-12 21:11:05 | [feed][i]sent 1,0 AC
2017-01-12 21:11:06 | [mlat][i]MLAT configuration received, service ENABLED
2017-01-12 21:11:06 | [mlat][i]Starting MLAT with preconfigured position: <I REDACTED THIS BIT>
2017-01-12 21:11:06 | [mlat][i]MLAT bandwidth reduction active, level 1
2017-01-12 21:11:06 | [mlat][i]Configuring UDP connection udp://52.76.75.15:19788
2017-01-12 21:11:06 | [mlat][i]Registering MLAT station
2017-01-12 21:11:06 | [mlat][i]Registering MLAT station: SUCCESS
2017-01-12 21:11:09 | [feed][i]removed 1 of 2 AC
2017-01-12 21:11:09 | [mlat][i]No ADS-B time reference available (0/1)
2017-01-12 21:11:09 | [mlat][i]Pinging the server
2017-01-12 21:11:09 | [mlat][i]Stats 0/0
2017-01-12 21:11:13 | [feed][i]removed 2 of 3 AC
2017-01-12 21:11:17 | [feed][i]removed 1 of 2 AC
2017-01-12 21:11:19 | [mlat][i]No ADS-B time reference available (0/0)
2017-01-12 21:11:21 | [feed][i]removed 2 of 3 AC
2017-01-12 21:11:25 | [feed][i]removed 2 of 3 AC
2017-01-12 21:11:28 | [mlat][i]No ADS-B time reference available (0/0)