Hi, There is a safe site, which will give you the exact of vakya panchangam in Rasi. I do not know about Navamsa perfection, as it may differ from, due to calculation method.
The link is
astraura.org
Select vakya and input your details. Get latitude and longitude from other sites, and input there. Just select what you want, like horoscope and dasa etc.
It will be tallying with the vakya panchanga if you give correct details. This is true and you could visit the site to know more .
Even though, there are KP items, there, please click cast horoscope as per vedic astrology link in the page

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