demococcus

I had the same issue, but everything went back to normal when I updated the firmware (I've never had done it before). Try that before scraping this old machine

http://www.gpsinformation.org/joe/gpsantennaspecs.htm So GPSMap has better receiving performance because his antenna is physically bigger, and not because of it's type, right ?

Yes, the helix antenna makes a huge difference under trees. I had GPSMap60CSx and it was much more accurate than my new Oregon 600. With the GPSMap I was able to say exactly which tree has the cache, while the distance shown by the Oregon varies so much that I often have to check 3 or more trees within a much larger radius. Also, the screen of GPSMap is much brighter. The readability with backlight off was so good, that I only used the backlight at night. The brightness of Oregon isn't bad at all, but it cannot compare with GPSMap. On the other side, I find that 160x240 is way too small for using the map comfortably. Scrolling with the joystick was a pain for me, typing names too. The Oregon (240x400), is a different story - you see much larger segment of the map and you can easily scroll and zoom, which is really handy for hiking and city exploring. I think the accuracy of GPSMap makes it better for geocaching and Oregon 6xx is more flexible and more convenient for hiking/general use.

I also have one of these nice and reliable old GPSMap60CSx devices. You can load details like name, difficulty, hints, last date found... No images or cache notes, unfortunately. If you are not familiar with GSAK, you may read my step-by-step tutorial. Here are two screenshots of the final result: