My name is XXXXX XXXXX I'd like to help you with your iPhone problem but first I'm going to need some more information. You say you're trying to sync your iPhone with your GPS but I'm not sure why. Can you please clarify the reason, and what goal you are trying to achieve with this? Also please let me know what model of iPhone you have and the firmware version it is running, and what model of GPS you have. Thanks.
Thanks I understand what you are trying to do now. In order for the Garmin to work with the iPhone the phone needs to be paired with the Garmin. In order to do this the iPhone needs to be set to "Discoverable" mode in order for the Garmin to pair with it. Once the 2 units are paired it will always automatically detect the iPhone when it comes in close proximity with it.
Here are the instructions for putting your iPhone into discoverable mode, then you can execute the pairing process on the Garmin:
1) Turn the iPhone on
2) Launch Settings
3) Choose "General"
4) Choose "Bluetooth"
5) Make sure Bluetooth is set to "On"
6) If it is then turn it to "Off" wait 10 seconds and turn it back "On"
7) Now you can go to the Garmin and follow their directions for pairing
Let me know if you have any further questions and please don't forget to click the green "Accept Answer" button so that I may be paid for my service. Thank you.