http://www.smartphonemag.com/forum/topic.asp?TOPIC_ID=23291

Answer: Unfortunately, the HP iPAQ 1910 is one of the devices that are the least meant for using GPS units because

1. it has no built-in Bluetooth and it has no SDIO meaning you can't use SD Bluetooth cards with it to connect to external Bluetooth GPS units
2. it doesn't support serial cables - cabled solutions, which are very popular when used in cars, won't work either

This all means you can only use infrared-based GPS units with the 1910. Very few GPS models (more exactly, cradles) support this; for example, the Haicom HI-203. Please also see this thread. (Also note that, while the iPAQ 1930, the “basic” WM2003 model in the 19xx series, doesn’t have serial support either, it already supports SDIO. That is, while many recommend using infrared-based GPS units to be used with the 1930, getting a SDIO Bluetooth card if you otherwise have enough built-in memory for your apps may be preferable.)