Separately, there is a scalable nationwide map on the Low Power FM Opportunities   page that may give you a quick sense as to how many LPFM channels might be potentially available in your region, without needing coordinates or other technical data. Here too, the map cannot factor in all considerations affecting the ultimate suitability of any particular location of channel.
Tool Options. Applications for new LPFM stations must currently meet certain distance separation requirements to stations operating on and applications proposing operations on second-adjacent channels and intermediate frequency (I.F.) channels (+/- 53 and 54 channels). The Commission is currently considering standards for waiving second-adjacent channel spacing requirements and a proposal to exempt LPFM stations operating at less than 100 watts from I.F. spacing requirements. See the Fifth Report and Order, Fourth Further Notice of Proposed Rulemaking, and Fourth Notice on Reconsideration in MM Docket 99-25, FCC 12-28, released March 19, 2012 [ PDF  | Word  ]. Commission action on these proposals could affect LPFM channel availability at many locations. Searches can include or exclude either or both of these spacing requirements to help LPFM applicants take into account these potential rule changes.
Determining Latitude and Longitude Coordinates. Applicants are responsible for accurately determining the NAD 27 coordinates of potential transmitter sites. Many applicants retain surveyors to help determine the proposed station coordinates. Owners of existing tower structures should also have this information. Employees of the Audio Division or other Commission staff cannot assist users in this process. Coordinates must be determined to the nearest 1 second (degrees/minutes/seconds = DDD/MM/SS). Global Positioning System (GPS) receivers provide an alternative method for determining coordinates. However, WGS84/NAD83 coordinates obtained from a GPS receiver must be converted to the NAD27 coordinate system  before entering data. Similarly, decimal coordinates must be converted to degrees, minutes, and seconds , to the nearest second. Applicants are cautioned that the inaccurate specification of coordinates may result in application dismissal. Applicants unable to identify an available channel at desired site locations may wish to engage the services of a consulting communications engineer.
The LPFM Channel Finder search tool is intended solely to assist LPFM applicants in
tentatively identifying available FM channels. There is no guarantee that channels
represented as "available" will be technically acceptable at the time an
application is filed.|
Users should be aware that neither the FCC nor the United States Government shall be responsible or liable for any loss, expense, or damage arising from or incident to the use of this program or the underlying data. This program cannot be used to file an application for an LPFM station or to amend a pending application. Use of the search tool does not confer any authority to operate a radio broadcast station.
LPFM Channel FinderNAD 27 Latitude and Longitude: (degrees/minutes/seconds)
Additional InformationComments or questions about the LPFM Channel Finder program may be sent to Dale.Bickel, firstname.lastname@example.org .
More information about Low Power FM (LPFM) radio broadcast stations  and the LPFM service can be found at http://www.fcc.gov/encyclopedia/low-power-fm-broadcast-radio-stations-lpfm .