@Graham Lockley
"Strange, I have been using an HTC Diamond for the last 4 months and it hasnt crashed once ? This is despite using it to run Memory Map and Tomtom (and a load of other apps/hacks). Oh but of course neither of those apps are available on a *superior* platform (along with a whole lot more).
Get real FFS, lose the 'Microshaft' attitude !"
Google maps and Google Earth work really well for GPS applications thanks. Does having to use a stylus piss you off?
FFS loose the Anything But Apple and JesusPhone mentality - then perhaps you wouldn't encounter the Microshaft attitude as much.
What is great is the choice of apps available for the iPhone now, all at reasonable prices, with a heck of a lot of good freeware. I used to have an SPV M3100 (htc Hermes) which I found as stable as a newborn calf, it was admittedly crippled with Orange crapware, and the software availability for the win mobile was woeful. What was available was overpriced as well. Whether this particular app is "needed" is neither here nor there, the fact that you can choose is what's important.