Keep seeing mention of this WSPR database - feel a Google search coming on.
Full locator is IO90IV,
 or more accurately IO90IV58EI (using GBR36 mapping)
  or   IO90IV58AH (using WGS84)

Andy  G4JNT
www.g4jnt.com



2009/1/26 John P-G <[email protected]>:
> On Mon, 26 Jan 2009 19:28:19 -0000
> "Gary - G4WGT" <[email protected]> wrote:
>
>> John, LF,
>>
>> I note that Jim's WSPR is showing 4 locator characters on my WSPR
>> list but 6 on the spots page.
>>
>> Gary - G4WGT.
>>
>
> Hello Gary, LF
>
> WSPR itself only transmits the 4-figures (eg IO90) but if you enter all
> 6 in the options dialogue of the software (along with your correct
> callsign, NOT K1JT - hi!)  then any spots you report to WSPRnet will be
> tagged with your 6-figure locator (as a receiving station). Furthermore
> it appears that the database at WSPRnet is clever enough to apply that
> 6-figure locator to any spots others make of your own transmissions....
>
> If you notice Andy's reports all show him simply as "IO90" - when most
> other people are 6-figure accurate. I can only assume it's because he's
> never sent a spot to the database as a RX station, with his accurate
> 6-figure locator attached. If he did so then all later reports of HIS
> signal would be 6-figure accurate too, due to the database cleverness.
>
> Not really a problem, but it aids accurate distance calculation.
>
> Cheers,
>
> John
> GM4SLV
>
>