Q on a nagative longitude... what to use?

[Two Plugs]

Hi guys 'n girls

I'm very, very fond of my TomTom Urban Rider but I hardly use it to navigate on GPS coordinates. Navigation on postal code or postal address is normally enough to get me where I wanna go... Preparing my journey through Ireland, I discovered that some places of interest use a 'negative' longitude, where others replace the '-' sign by '0' or '00', for example:

Latitude: 52.2250
Longitude: -9.4600

Or:

Latitude: 52.2250
Longitude: 009.4600

Whats the difference, and which one to use?

[bogdanbc]

Hi guys 'n girls

I'm very, very fond of my TomTom Urban Rider but I hardly use it to navigate on GPS coordinates. Navigation on postal code or postal address is normally enough to get me where I wanna go... Preparing my journey through Ireland, I discovered that some places of interest use a 'negative' longitude, where others replace the '-' sign by '0' or '00', for example:

Latitude: 52.2250
Longitude: -9.4600

Or:

Latitude: 52.2250
Longitude: 009.4600

Whats the difference, and which one to use?

"-" == Wnnn.nnnn
"+" == Ennn.nnnn

[JosepM]

I would try to do reverse engineering:

just choose a known point W of the Greenwich meridian, and see what happens. Then do accordingly with the rest of them.

Regards,

Josep

[SB]

which one to use?

Garmin 

[Red]

which one to use?

Garmin 

Naaaah: Google Maps on an HTC One 

Red