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oh and heres proof of concept of mismatchig datums within an internal system...
take this website for example:
http://www.target.com.au/html/stores/stores_frame.htm
type in:
159 - 175 CHURCH ST
Parramatta 2150
Notice on the store list at the Bottom, the RED 1 is the matching location with the exact address, yet the yellow thumbpin on the map is about 200m off to the NE of the RED 1??
http://www.nowwhere.com.au/mapurl/ma...33.89926&PL5=4
this is what happens when datums are mixed... makes the whole device useless... so to answer the original thread posters question, don't bother with the cheaper HK unit... in this case you won't even get what you paid for and you may end up in the water...
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dsp26 is exactly correct, with the whole datum and flat piece of paper (map) not lining up with the geiodal shape of the earth,
