I currently use a Foretrex 301. I love mine.
That being said, if there are any Foretrex users feel free to correct me, but these are my opinions about the Foretrex.
In regards to your original inquiry, I do not believe that either of the 301 or 401 Foretrex models would fit your needs. The screen is too small and not detailed enough for effective navigation. The advertised point to point navigation is almost non-existent and I believe to be misleading. The 401 model does track temperature, but I personally feel that the feature is unnecessary.
Spending nearly 2 months shopping for a GPS device that would fit my needs, I choose my Foretrex because I only needed a GPS that could accurately display my current position (in UTM) and used AAA batteries (My cell phone was too unreliable).
For my needs the Foretrex is perfect.
If I wanted anymore from my GPS, I dont think that Foretrex is a good choice.
EDIT: to answer question about maps
For nearly most of my navigation for personal and professional (I work as a outdoor guide for week long trips) I find that GPS devices cannot be solely relied upon. I have been mislead by them too many times. You've most likely research other individuals who have said this, but GPS…
DEVICES ARE TOOLS TO BE PAIRED WITH A TOPO MAP.
I primarily rely on USGS Topo maps for both my personal and professional use. I understand that you may be out of the country and that accurate topo maps may not be easy to access. But I would not purchase a GPS hoping it to be a silver bullet for proper navigational tools such as a good map.
I have had no experience with watch GPS, but from my 2 month search for GPS devices, I found that most of them had severely limited battery life.