[TowerTalk] FAA & Towers, continued

[Ken]

You can download topo maps online that will give you as good as 10 ft intervals depending on how flat your terrain is.  See 
http://store.usgs.gov/b2c_usgs/b2c/start/%28xcm=r3standardpitrex_prd%29/.do

Ken

On Dec 30, 2011, at 9:51 AM, William Hein wrote:

> Thanks for all for the great advice and info!  TowerTalk really proving its value to me here.
> 
> I am filing out FAA form 7460-1 online right now.  It asks for the exact altitude ASL of my tower(s).  How do I find this out?  I can extrapolate from Google Maps but that won't be accurate to a foot, neither will be my consumer grade GPS.