I don't really want to get into a long debate here, but just to put in some background info. I travel a lot in the uk and have done for many years. For the last couple of years I have used either Nav free or waze as sat nav maps on my iphone. Whilst there has been some errors, they have been useable - and of course you have to use your common sense whilst using them.
On this occasion someone emailed an address to me in Leicester. I wanted to drive from on point in Leicester to this address that has been emailed to me. I clicked on the address in the email and it defaulted to the apple maps and plotted a route. It was about 1 mile away and told me it would take about 8 mins.
This was the worse journey I have experienced with a 'sat nav' - it tried to take me through 2 pedestrian areas and 1 no entry in that short journey. Clearly I didn't go I. The pedestrian areas or turn into the one way. However, the apple. Aps persisted to try and make me take these route, and I. The process kept urging me to take a u turn where it was clearly sign posted that it was illegal to do so.
In the end, I pulled over and switched to Waze - it directed me straight to my destination without any errors.
The point is, I am not talking about a mistake in the middle of no where. This is a major city in the UK - and fairly central ie near the city centre.
Generally I love Apple products and don't knock them as a company.
The original question was genuine- can I change the default mapping app so that I don't end up using the apple maps app again. It was a disaster like nothing I have seen before.
I now know that the answer is no.
Apple clearly need to sort this out.