I too have iGuidance (previous 3.x and now 4.0) with the Microsoft Streets & Trips GPS (Pharos i-360).
The trick with this software (both version 3.x & 4.x) is to load the software in main memory and then put the maps on the storage card (with 4.x you don't have any other choice, there's no room in main memory for 2gb of maps).
If you load and run from main memory you will not get the degregaded performance, and the program will not abruptly stop.
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