Solar Compasses for spotting marine life, hiking etc
Solar compass
SOLAR COMPASS includes cardboard busola and string and an app that requires you to enter the shadow angle measured whilst pointing the busola to the target and using the string as gnomen. Works fine. A simpler approach is to have a sticker of a protractor, if you have one. I showed tools i used, but at the very least you can tear cardboard in any shape and use cap of ginger beer bottle (only this bottle; do not know why only this bottle cap) to make markings and draw an arrow extending outwards from 0 degrees and pointing to target direction.
D.I.Y. solar compass protractor
Solar compass web app
Solar compass - how it works
Double gnomen for spotting solar compass protractor
Top side - equatorial sundial - Southern hemisphere
Underside - equatorial sundial - Southern hemisphere = northern hemisphere top side)
Spotting & catching the SPOTTED GRUNTER fish on a budget
BUT WHAT IF THERE IS NO SUN ?
Simple Shark Spotting even if there is no sun.
If you don't want to use the groove, dial and string because you have an Android phone
Map-based Shark Spotter V1. I created this app in much less than an afternoon. Originally i wanted simple app to point out where to paint North South arrow onto pavement, at beach.
2 web apps for shark spotting and one for painting an arrow at the beach that points to True North, for use with a homemade 360 degrees protractor, as seen elsewhere on this site.
Shark Spotting. Hope it helps. Final cheap solution
