Here's the issue:
I'm very proficient at reading 1:50,000 maps for bushwalking purposes.
I now have a GPS (eTrex 20x)
I want to input a waypoint from the paper topo map into my GPS
The reason I want to do this is that navigation to this point (on an upcoming walk) is tricky by map and compass alone.
Then when I get into the field I can follow the GPS (and map) to that point
However, I'm aware that I cannot input Australian Map Grid Coordinates straight into the Garmin GPS
The solution must be to input the Lat/Long coordinates.
My topographic map does have Lat/Long markings along the side - but there are no grid lines!!
So trying to read a very accurate Lat/Long point is impossible.
Here's my answer:
Take an appropriately graduated ruler and measure the S and E
Then input the numbers from the ruler into the GPS.... done?
I've noticed that Lat/Long rulers are available, but the distance does vary between grid lines with Longitude across the globe obviously.
https://www.maptools.com/lat_lon_tools
Sorry if that's long winded. Am I on the right track here?