GO 620 Not Synching Contacts
My TomTom GO 620 will not synch contacts. All the instruction manual says is that "Each time you connect your device to your phone, the contact book is updated." This is not happening. No instructions are given for manually synching. My iPhone SE is connected via MyDrive to the GO620. I can send a route from my phone to it. I turn everything off and restart, but the contacts do not transfer. I seem to recall synching them in the past, but now, the GO620 has no contacts in it whatsoever. Any ideas on what might be wrong and how to fix it? Thanks very much.