Thaum xaiv txoj kev kos npe rau daim ntawv qhia, nws yog ib qho tseem ceeb uas yuav tau xav txog qhov chaw ib puag ncig, kev pom thiab kev xav tau ntawm cov paib. Visibility yog ib qho tseem ceeb tshaj plaws kev txiav txim siab thaum xaiv cov ntaub ntawv muaj kev cuam tshuam. Xaiv cov ntaub ntawv qib siab uas muaj kev cuam tshuam siab, xws li Qib A lossis Qib B, kom pom tau qhov siab tshaj plaws thiab kev nyab xeeb ntawm cov paib ntawm txoj kev. Tsis tas li ntawd, xyuas kom meej tias cov ntaub ntawv siv tau sib haum nrog ib puag ncig qhov kos npe nkag mus, xws li ib puag ncig marine lossis huab cua kub. Durability kuj tseem ceeb heev thaum xaiv cov ntaub ntawv zoo. Cov ntawv yuav tsum tuaj yeem nyob ntev ntev yam tsis tau ua npub lossis fading. Feem ntau cov ntaub ntawv qhia txog yog ua los ntawm acrylic resin uas tiv taus qhov kub thiab txias, av noo thiab lwm yam hnyav, ua rau lawv zoo meej rau kev siv cov paib.
