Sounds like you're right on track craftycoder. Although your terminology is off a bit. For instance while your differential between the cell and the GPS is right on, the GPS is still using radio tech.
Global Positioning System
GPS frequency overview
|Band ||Frequency ||Description |
|L1 ||1575.42 MHz ||Coarse-acquisition (C/A) and encrypted precision P(Y) codes, plus the L1 civilian (L1C) and military (M) codes on future Block III satellites. |
|L2 ||1227.60 MHz ||P(Y) code, plus the L2C and military codes on the Block IIR-M and newer satellites. |
|L3 ||1381.05 MHz ||Used for nuclear detonation (NUDET) detection. |
|L4 ||1379.913 MHz ||Being studied for additional ionospheric correction. |
|L5 ||1176.45 MHz ||Proposed for use as a civilian safety-of-life (SoL) signal.|
Check this how it works link out. Pretty decent explanation.
As opposed to the radio frequencies of cell phones. Below are the ones used in the U.S.
Frequency bands used in the United States
|Current / Planned Technologies ||Band ||Frequency (MHz) |
|SMR iDEN ||800 ||806-824 and 851-869 |
|AMPS, GSM, IS-95 (CDMA), IS-136 (D-AMPS), 3G ||Cellular ||824-849 and 869-894 |
|GSM, IS-95 (CDMA), IS-136 (D-AMPS), 3G ||PCS ||1850–1910 and 1930–1990 |
|3G, 4G, MediaFlo, DVB-H ||700 MHz ||698-806 |
|Unknown ||1.4 GHz ||1392–1395 and 1432–1435 |
|3G, 4G ||AWS ||1710–1755 and 2110–2155 |
|4G ||BRS/EBS ||2496–2690|