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You don't need the map if you enter your address or coordinates.
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Only if Google Map's geocoding of the address is accurate enough and there's no way of knowing unless you also look at the map view. I learned (the hard way) several years ago to never trust the address look-up without using the online map to verify it. Besides, the basic map view provides some topographical elevation data that you learn to read after awhile plus the satellite view allows you to see tree and foliage cover, something the basic radar plot does not account for.
Accurate GPS coordinates are the best. Not much ambiguity with them, plus you can look at the location easily in other applications to better read the terrain and surroundings.