How do I choose the best GPS for my application?

The newest GPS technology we have today is the SiRF IV GPS modules and we offer two products, the ISM420 and the ISM480. The ISM420 is a ROM based solution with no antenna attached, while the ISM480 is a Flash based solution with antenna attached.  Ideally, one of these two GPS will fit your need.

If you are looking for custom firmware for a specific application we may suggest the Sirf III based modules  for example high altitiude ballons for example, you will use the ISM300F2-C5.1-VOO4 which is designed specifically for high altitude.

Also, if you are looking for a GPS that is easy to solder down and has the ability to snap on various external antenna’s I would choice the Sirf III based ISM300F2-C4.1 that has a connector on top of the module or you can run on your board via a 50 ohm trace.