New CF card advice

[getsurfers]

Looking to replace my Pretec CF (SirfStar II) with a SirfStar III.

Using TT5.21 on Axim X5.

Do alot of driving in London, so need something with a quick lock (pretec takes an age and is continuosly loosing lock lately) and one which won't drop the signal when travelling down narrow streets with tall buildings.

Been looking at the Haicom 303s and 305III. Any owner confirm if these are any good, or which of them to go for?

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