Does the iPhone's GPS really not need cell signal?

**Lord Farkward** · 08-23-2009, 06:11 AM

I ask this because I have recently returned from UK and my iPhone on roaming refused to let the Maps app work - and yes, I was under open, clear sky too.

Any insights as to why it didn't work? Thanks in advance!

**sursture** · 08-23-2009, 07:50 AM

I had the same promlem...why? ...not sure.
But I solved it by installing TomTom for iPhone.
read more here:
TomTom Announces iPhone Collaboration at WWDC | iPhone News Updated

**Poseidon79** · 08-23-2009, 10:16 AM

The Maps app uses your cellular data connection to download the map. Without it you will have a blank screen with a blue dot on it.

**BlackWolf** · 08-23-2009, 10:23 AM

the iphone has assisted GPS. that means that the gps works without a cellular signal whatsoever, but it will be slower.

and like poseidon said, maps can't work without a connection because ... well ... where should the maps be coming from?

**Mes** · 08-23-2009, 10:31 AM

No cellular signal is required IF you have preloaded maps. IE: xGPS. In fact, you don't even need a SIM installed

. It takes a bit longer to acquire your current location but it works

**BlackWolf** · 08-23-2009, 10:35 AM

Originally Posted by Mes

No cellular signal is required IF you have preloaded maps. IE: xGPS. In fact, you don't even need a SIM installed

. It takes a bit longer to acquire your current location but it works

I think there is also an appstore application called "OfflineMaps" ... never tried it though

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