The fastest locking GPS receiver seems to be Garmin GPS35 and GPS16 according to people on this forum and from personal experience. Garmin is software configurable. You can turn on and off each of the signals it receives. If you ever want to use Copilot software in the future, you have get either Copilot receiver or Rand Mcnally receiver. Both suck though but they get the job done. Actually any GPS will work just fine though Garmin seems to lock faster than other receivers. My next GPS receiver will be Rand Mcnally because it'll work with Copilot 2K3 and other softwares as well.