I used my phone as s sat nav for ages. Started off with copilot but as you couldn't ask it to totally avoid motorways no matter what, I switched to Here maps. It was a good sat nav but then they updated it and it kept crashing. Moved to the Tomtom app and paid for a years subscription. Worked faultlessly and got me to loads of places around the uk. Both on bike and in cars/vans. So I thought I would bite the bullet and buy a Tomtom 410. It's a great bit of kit and had some very good features. Like the choice of great motorcycle rides in the UK and Europe. But... It needs a phone connected to it to get live traffic. This works how it should. However, the phone call quality through the tomtom connected to my schuberth src pro was really dog shit. I swapped the src pro for the sena 10u for schuberth helmets. Was better but still not as clear as having the phone connected to the helmet. Also tomtom doesn't support music being played through it. So, if like me, you like listening to music in your lid on long trips, it's a downer on the system. So, I toyed with the idea of sending it back but really like the ease of the unit. After much searching to find a work around I decided to forget it and get pished. Went to tesco to grab some lubricant for the soul and spotted a smart phone on pay as you go for £25. Bingo! I bought the bike it's own phone. It shares its data with the tomtom and lives permanently under the pillion seat. As my helmet can connect to a sat nav and a phone, I have my phone connected for music and phone calls. This might seem like a ball ache to most of you but I do a lot of miles on the bike so it was worth it for me.