Which Garmin?

I have been looking at the garmin edge computers but I am still a bit mistified as to what the differences between 305 and 705 are. I thought at first that 305 was just hrm and speed distance etc but then i saw somewhere that it was satnav too. Basically could some-one to point out the differences between them all for me?
Your'e never alone with schizophrenia.
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Basically...
Both are part of the Edge series. The 705 adds:
Maps
Larger screen
Longer battery life
Colour
Power meter compatable
The most significant being the ability to have maps.
what is the advantage to having a map?
what is the general consensus. is it worth the extra money?
BTW, if any one knows how to load Navigator maps onto a SD Micro card from the CD Ronm, could they let me know?
DB
You can see where you are and decede where to go.
It depends what you are going to use the unit for. I use it mainly for recording routes and navigating on sportives and the 205/305 is fine.
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