In reply to G7LAS:
Spanish ham callsigns have a number related to the specific area of the country where the station is going to be placed at the moment of getting the license:
1 for the North West
2 for the Central North
3 for the North East
4 for the center
5 for the Eastern coast
6 for the Balearic islands. Unique DXCC country.
7 for the South
8 for the Canary islands. Unique DXCC country.
9 for the 2 Spanish cities in Northern Africa. Unique DXCC country.
0 for the King of Spain and special event stations in the air for something related to an official visit or special event carried out by the King of Spain.
Before the new ham radio regulations were published in EA around September last year, it was mandatory for Spanish hams to inform it when we were transmitting from a call area different to that of our callsign.
Not only for portable stations like a SOTA activation but also for base stations in case some have second houses in other call areas of Spain.
I always found this senseless as long as we were in other call area of the peninsula, within the same DXCC country, and absolutely necessary when we were in one of the call areas which were a different, unique DXCC country.
When they were preparing the new regulations, I wrote my recommendation to change this rule and it looks like they took it into account.
This is not anymore mandatory as long as there's not change of DXCC country, but it's still up to the operator to keep saying it.
EA5XYZ/1 would be a ham who obtained his license in the East coast area (i.e Valencia) but is currently transmitting from the North West call area (i.e. Pontevedra), either base or portable station.
However, he may also be saying just EA5XYZ while transmitting from Pontevedra and it would be perfectly legal according to current regulations.
In case he transmits from Mallorca, he will be forced by law to say EA6/EA5XYZ.
Best 73 de Guru - EA2IF