I have been intrigued by some of the news reports and comments about the 20 minutes that Lt Gliniewicz was reportedly "on site" before he radioed in about the three suspects. As I posted before, I have a background in electronics and radio communications and I wanted to try to answer some questions about what model radio the Lt might have been carrying that would have GPS capability.
The short answer (according to my findings and understanding) is that the
report by Filenko - that the GPS was in the squad car and connected to the computer terminal is
most likely the case.
I have installed units like those (GPS and all) in police vehicles in the past and while I have seen and even installed GPS in two way radios in my past as well, there are very very few portables that have that capability. It's clear from the pictures and one of the rewards offered, that Fox Lake PD carries "Motorola" radios. I can not find any portable (hand held) units that have GPS that Fox Lake would likely have had in their system.
This does not mean for certain that the Lt's portable radio did not have GPS capability but I highly doubt that it did. GPS receivers usually require a special antenna with a clear path towards the sky to receive signals from the GPS satellites overhead. The GPS systems in cell phones are an exception to this. That is because they (cell phones) have multiple cell towers to use for triangulation and so they do not rely on a clear path to the GPS satellites overhead.
I hope this information is helpful towards answering some of your questions.