Hi,
I was in
ICN a couple of months ago, and used that guide in spotterguide.net as a starting point. A couple of observations though:
- Spot 1 is quite a large area, you can be as close or as far to the airport fence as you want. I would recommend to keep your distance as I was asked to leave by security personnel and I was some 20 - 30 meters from the airport perimeter wall. I would guess that if you are next to the road it would be fine. Not mentioned in the guide is that you can reach both this spot as well as spot 2 - afternoon arrivals, park - by using the free hotels shuttle bus.
- Spot 3 (Sky Deck) is a very nice location, but usable only during the winter, as you're really far away and heat haze
IS an issue. If you want to venture there, be aware that the bus stop is NOT "Paradise Hotel", but this one:
http://goo.gl/maps/r6s9cDpcAuG2
Also, very important, the bus that takes you to the sky deck departs from the ARRIVALS level of the terminal. Confusingly enough, the same bus also stops in the same bus stop on the departures level, but it will take you to Incheon city! Don't ask how I know...
Cheers,
Miguel