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Hudson River

 
 

National Prevention Department

Fast Boat On Patrol

 

Iphone app often used by air observers for marking maps with 

more detailed info:

Solocator - GPS Field Camera to stamp photos with location, direction, altitude, date, time + optional editable notes by Civi Corp

https://appsto.re/us/1CyUI.i

There is also an Android version, you'll need to search

the Playstore to download.