http://forum.ppcgeeks.com/showthread.php?t=17032
This is the official thread for GPS issues and the Mogul.
iGuidance 4 works great with GPSgate and holux GPS viewer.... see clipping of post below
iNav iGuidance:
Requires software such as "Holux GPS Viewer" to start the GPS.
Requires 1.3GB of storage space for North American mapping data.
GPS seems to be detected (icon turns green), but will rarely refresh the screen with updated location data. This issue is discussed HERE, HERE, and in this thread. I remember having problems with iGuidance before, when targeting it to the Microsoft GPS redirector port with my Bluetooth GPS. I had to point iGuidance directly to the Bluetooth COM port. This seems to be a problem with iNav's inability to work properly with the Microsoft GPS redirector driver. Customers should shoot off an email to INav, so that hopefully they can fix this issue.
A workaround is to install a different redirector, such as Franson GpsGate. Once installed GpsGate installs a tray icon in your Today screen (red or green icon in lower right hand corner of the Today screen).
Tap the tray icon, and choose the "Settings" menu item.
On the "Input" tab set it to "COM4".
On the "Output" tab, choose "Virtual COM Port" under the "Add output" section, and press the "Add" button.
Set the "Virtual port" to an available COM port, such as "COM2".
Press the "OK" button.
On the "Input" tab press the "Open" button.
In iGuidance:
Go to the "Tools" menu, and choose the "GPS Options" submenu, then choose the "COM Port" submenu item. Set it to the same port you used for your "Virtual Port" (COM2 in the example above).
Go to the "Tools" menu, and choose the "GPS Options" submenu, then choose the "Baud Rate" submenu item. Set it to "4800".
A freeware alternative to GpsGate, named GPSProxy, is available HERE. (untested)
I created an iGuidance one tap autolauncher. If GpsGate is not running, it starts it. The script then stores your device's current power timeout, and backlight timeout and brightness settings. Then sets your device for no timeouts for power and backlight, and sets your backlight to maximum brightness. It then sets iGuidance to skip the startup warning dialog, before launching iGuidance through AstroGPSLauncher. Once you exit iGuidance the script will restore your previous backlight/power settings. The only thing not working in the script right now is that it doesn't terminate GpsGate on exit if the script started GpsGate. I have not found a reliable way to close GpsGate. All current methods I've tried of closing/terminating GpsGate leave an unresponsive icon in the tray of the Today screen.
For those who are interested, I've made a copy of this script available for download HERE. Instructions on how to install/use the script are in the included "iGuidanceInternalGPSLauncher.mscr" Mortscript file.