This video explains it https://www.youtube.com/watch?v=kvQ2IU3ILRo&list=PL3n8cHP87ijDnqI8_5WQlS4tN37D6P4dH&index=8&t=52s
I think by 'left sternal border' they're referring to the Erb's point - left 3rd ICS on sternal border.
Even I got it wrnong thinking tricuspid area is being described!
rateG odiev no S1 adn ti's tpis!l!
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eaPsle daer teh astl etncsene fo eth .sonequit I inhkt eht pitls htmig eb usbceea fo .,Rbb tihs ussace the amitrl dna rcpisiudt vvlae ot csloe at terniffde is.tme
o-s ihwch of eth oiwllonfg stbe iplensax the sirft ntopcnoem fo teh rheat dosun (ptlsi ).S1 lhoSud be eht alrtim lvvae oculrse erbefo het rptudicis v.avel
submitted by โlfsuarez(160)
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$279$49tiFsr erath odsun ()S1 si reteneagd yb wto hatre e:vvsal eht raimlt vlave adn uitidrcps evval. laNrye susmntiuaoel gioscln fo ehste easvlv naolymlr eengatsre a lengsi 1S du.sno pttngliiS of teh S1 nosdu si rdeha ewhn amltir dna siiudtrcp slveva locse ta llthsgyi ieretffnd t,semi wiht lausyul het ltirma cslgion febreo rdtpicuis
$279$49