I'm working on GPS tracker for automotive applications. Device should work in 9V-30V supply voltage range. In practice it will be fed from 12V car installation. This enforces the implementation of some protection/filtering circuit at the power input.
After reading some threads on load dumps, voltage transients, reversed polarity connection I feel a little confused. I'm not sure that design I came up with would stand against those hazards.
I'm also wondering if this could be done with less part count. I'm stuck with fuse selection as well. Should I use glass or PTC in this case.
I would appreciate any feedback on the following circuit. 
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