Introduction

You are running late for your anniversary dinner. Your significant other has called you from outsite the fine restaurant where you are supposed to meet for a romantic outing. Unfortunately, your spouse's cell phone call is cut-off before you can catch the name of the restaurant. Your return calls keep dumping to voice mail. If you miss the dinner, it will be a very dangerous situation indeed.

You have one thing going for you. Your spouse's cellular phone has a trial GPS chip inside that records pseudoranges calculated from 3 received GPS signals and then calculates user position. Unfortunately, the phone must have been operating in a partially occluded location since the full 4+ pseudoranges required for 3D GPS location are not available. Since you are an electrical engineer, of course you can hack a digital cell-phone in seconds. You discover that through some quirk of Springularizon's protocol, your handset somehow has your spouse's pseudoranges recorded in memory. You must use these pseudoranges to find the location of the restaurant.