Ahjun, you should try papago. Should be working flawlessly. sos apple

PPG isn't perfect but since you've been using Garmin previously, you'll know the advantage of PPG is the map database.

While software can be blame at times for low signal etc, you should realize that it's the first time you start the app. Every GPS app will need sometime for a cold start. Everyone know that.

Secondly, hardware can be blame as well. I'm pretty sure iPhone doesn't equipped with SirfStar III if you what I meant.

Try other GPS app for iPhone and if response is slow, it's a safe bet to say that hardware does carry the responsibility as well