On Monday, April 17, 2017 at 11:00:40 AM UTC-4, Dan Marotta wrote:
An odd thing happened yesterday. Throughout the day, I kept seeing the
same glider, 5D, on my ClearNav, fed by a PowerFlarm portable. As we we
approached the airport, I tried to contact the glider to coordinate our
approaches and got no reply. Finally the glider pilot announced her
intentions and I queried on her position. It was who I thought, having
recognized her voice and call sign. I know she's the original owner of
this glider so I don't understand why the ID was wrong. I just
installed a new FlarmNet database about a week ago.

This has happened once before prompting the recent download. Other
gliders flying out of our home field display with the proper call
signs. Any ideas?
--
Dan, 5J

Have them check their flarmcfg.txt file - flarm id - $PFLAC,S,ID,YOUR 6-DIG code; they can find the correct one for their registration at http://www.avionictools.com/icao.php .

Then go to the registration page at FLARMnet to make sure they are the same.

I've seen people borrowing a usb stick to update their flarm, and it also over writes the flarmcfg.txt file; this is very confusing (seeing a Puchacz when the flarm id is an ASW-24..).