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Sonar (akafuna kwa SOund NAvigation ndi Ranging) ndi njira yomwe imagwiritsa ntchito kulankhulana ndi kapena kupeza zinthu pamwamba kapena pansi pa madzi. Kugwiritsa ntchito njira iyi koyamba kunakhalapo ndi Leonardo da Vinci mu 1490 kudzera mu chubu chomwe chinakhazikitsidwa mu madzi kuti apange ma vesi kudzera mu kuwonjezera. Zida za sonar zidapangidwa panthawi ya Nkhondo Yachitatu kuti zikhale ndi mphamvu yokhudzana ndi chiwopsezo cha nkhondo ya ma submarine; dongosolo la sonar losagwira ntchito, lomwe limangomva mawu a ma vesi, lidagwiritsidwa ntchito mu 1918. Zida zamakono za sonar zomwe zimagwira ntchito zimagwiritsa ntchito transponder ya acoustic kuti ipange mawonekedwe a mawu omwe akudzera kuchokera ku zinthu zomwe zikuphatikizidwa.

Chithunzi ichi chikuwonetsa chithunzi cha sonar cha Soviet Navy minesweeper T-297, yomwe kale inali Latvian Virsaitis, yomwe inakhalapo pa 3 Disembala 1941 mu Gulf of Finland.

• Kuwonekera kwa Khristu Pamaso pa Anth
• Samanea saman
• Gustav III

Zina Zosankhidwa zabwino – Zofunika