| Resource | Link | Classic Compass Instructions | www.arnavsupplies.com/files/Classic_compass.pdf | Magnetic Declination Information | www.en.wikipedia.org/wiki/Magnetic_declination | The USGS Map Store | store.usgs.gov | Tom Harrison Maps | www.tomharrisonmaps.com | Useful UTM Information | www.uwgb.edu/dutchs/FieldMethods/UTMSystem.htm | Longitude Latitude to UTM | www.uwgb.edu/dutchs/UsefulData/UTMFormulas.HTM | Adventure World Magazine | www.adventureworldmagazine.com | San Francisco Tide and Current Info | www.sfports.wr.usgs.gov/sfports.html | Free Tide Tables | www.freetidetables.com/ | The Libre Map Project | www.libremap.org/ |
