As stated in the disclaimer for the numbers,they have been collected from various sources over many years. Some are still good - confirmed last fall - some are not good anymore. A few were converted LORAN numbers, which have been found to be pretty close for the spots that are still there. Some of the numbers have come and gone with storms,
The airplanes are VERY difficult to find on a bottom machine - If you seewhat looks like afew fishjust off the bottomon the numbers, that may be the airplane.