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Fresh map is loaded onto a micro sd card, so if you unit has a slot for an sd card, then most likely yes it will work.
According to this link, the Etrex 20 does have mapping capability, so you are good to go I believe
https://buy.garmin.com/en-NZ/AU/on-t...prod87771.html
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cheers, all the info they give you is so vague and doesnt help if you can only just work this forum
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Guys - just go and talk to the boys over at NZOpenGPS. NZer's mapping NZ (topo) and routable downloadable for free!!!
They are supergeeks but great people. Donation is optional.
NZ Open GPS Project