Excellent GPS, complex enough, but extensible and Mac compatible

I found this great GPS for hiking, as it is:
- Very sensitive, even under vegetation or in buildings
- Uses 2 AA batteries or rechargeable batteries, so it's easy to take an extra refill. A 2300 mAh battery set me several days of short walks, and at least one continuous day
- Readable even in direct sunlight without the backlight, leaning a little
- Easy to handle with one hand, even with gloves (not too big anyway!)
- Waterproof (I have not tested!)
- The possibility of adding a microSD card greatly increases the plots or maps storage capacity
Namely: the embedded map is very accurate, so you either buy topographic maps Garmin (expensive) or use the free maps like those of OpenStreetMap ([...] I'd definitely recommend taking a glance Not only this site you can retrieve free maps (there are some in French.. [...] but you can also help improve these cards with your own layouts and comments Try it, it's very fun, you find yourself in the skin of early explorers mapping uncharted territory ... You will also find lots of tips on the use of the GPS (but not always in French).
The interface to Mac or PC is very well thought out, you can either connect as a simple USB key (which makes it easy to share, rename, etc. the data) or software for direct recovery paths or transfer cards, etc. Garmin has made an effort to Mac users, so there is no software on the CD, can be downloaded here: [...] A little research on the web, we find all the free tools to plan its hiking in advance, this GPS has a lot of websites offering advice.
In summary, an excellent GPS, fun to use, provided spend some time at the start to master and have access to a computer (if you do not want to buy Garmin maps).