In Garmin units you have to add it manually as a user datum.
One cool feature of Magellan units (well, the only one IMHO) is it can display two datums at the same time
rhyang wrote:Yes, this is why I like UTM -- it's metric, so no messing around with degrees, minutes, etc. Nice and linear.
The geko 201 has a datum setting which defaults to WGS 84, but I couldn't find EGSA 87 in the list of choices .. garmin has a list of available datums online here. I couldn't find much info on the Greek system via google .. probably I'd have better luck if I could read Greek