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Hi Rik, I have an E-trex 20 and it doesn't require a computer to input new waypoints. Here is how I do it.
It doesn't matter were you are you just mark a waypoint. Then you move up to the top of that waypoint's page and change the number assigned to the name you want to name it. Next you move down to the coordinates and then input the new coordinates of the waypoint you want. Easy to do try it.
I really like my E-trex 20! Here is another feature I like! I have a Garmin on my sailboat with the marine coastal waters charts chip which I can take out and put in my E-trex 20 when at the coast kayaking.