I have the update kit for the one I have. The thing I have figured out is, by turning the unit off when your away from the area that you first turned it on from causes it to load up other ones that the first 20 that I have aready found. I have a yearly membership with Geocaching so I have a pocket query sent to me. With just ones from my area that I have not found. I update them from uploading them to geomate jr website.
The biggest thing is turning it off as far from the place where you first turn it on for the day. That way when you turn it back on it will load the ones closest to your present location.
JJJFishin