I haven't tried this, however the description indicates that it should work.
Garmin Custom Maps
"Put paper maps on your compatible device with Custom Maps — a free and simple process that transforms paper and electronic maps into downloadable maps that you can transfer to your device. Custom Maps are created using our map-drawing technology to georeference map images."
source;
Edit: had a read thru the instructions, your GPS is supported for use with the Garmin Custom Map program.
It does say though, that for converting electronic maps you will need to convert them to a Jpeg first using GIMP
Seems like a lot of hassle, so you would be better of just getting your hands on a copy of OZtopo V3 or 4, or Garmin Topo 3.
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