Q. What do the electronic compass and barometric pressure sensor provide to the user?

Related FAQs:

1. What are the differences between the eTrex units?
2. How is the Thumb Stick (five-position cursor switch) used on the eTrex Venture, Legend, or Vista?
3. Do I have the ability to connect an external antenna to my eTrex?
4. Can I hard-wire my eTrex unit directly to a 12 V power source?
5. Can I mount my eTrex unit to my dash/handlebar/windshield?
6. Is my eTrex unit waterproof?
7. Is my GPS 72/76 series unit WAAS enabled?
8. How do you calibrate the barometer in my GPS?
9. Why don't I see an elevation profile?
10. Why don't I see a pressure plot?
11. Can my GPS unit take a pressure reading while the unit is off?
12. Is the altimeter or barometer temperature compensated?
13. What is "normalized pressure"?
14. What is the difference between ambient and normalized/barometer pressure?
15. Why did my unit note a minimal pressure change when I know that I climbed 1,000 feet?
16. Why does the elevation on my unit read 65,000 feet?
17. What is the minimum/maximum elevation the barometric altimeter will read?
18. How do I use the barometer to track weather patterns?
19. Will the calibrated altitude remain accurate if I move to a new location?
20. What happens to the pressure plot as my elevation changes?
21. Which pressure plot should I use to track the weather?
22. Why is the "total ascent" and the "total descent" different when I do a round trip?
23. Why is my "glide ratio to target" blank when I am navigating?
24. Why does my elevation plot show a sharp change in elevation even though my elevation has not changed?