Garmin eTrex 10 / 20

Garmin have a new eTrex range of low end hand held GPS units out. The eTrex 10 replaces the eTrex H (the one I currently have). At last USB is supported on these models. A few enhancements have been added to the 10 compared to the H while the price has been kept about the same. For serious mapping I would go for the next model up – the 20 – which can load and display topo maps with a colour display. How does this compare with a phone or Ipad? Well, there are no data charges which will save a lot of money over a longer distance or time. I will consider updating to the eTrex 20 at some stage.