Dear Freind,
One thing i can write for sure.Your husband might be in intercaste relationship ,i mean out of his community,religion etc.Navamasa is ninth division of lagna which tells us about spouce.
Navamasa is also used to study a person's internal properties,how a person behaves individually.There are two faces, behaviour of a person,one for the society and other for the home.For both environment,he or she will have different attitude,approach.For example, if a rich person tries to enter a five star hotel with rags and torn wearing,he might be pushed out for the reason he is not of that standard or may be he wont be able to pay bill.But from inside he is still a rich person,may be a CEO of a big company.So to intrepret navamasa is not that easy.But this is an advance portion of navamasa.
Simply it is used to study the chracterstics of spouce
-Anup
www.kascorner.com
Navamsa indicates the micro placements of planets in a constellation-nakshatra.
Planets in the asc chart finally are able to or not able to manifest the basic asc chart indications, based on their strength in the navamsa - whether elevated, debilated, enemy sign, etc.
while the navamsa cannot guarantee what is not indicated in basic chart.
since marriage is a life-long bond, navamsa charts too are referred and matched-verified, for the promise of a good marriage, for final assurance.
for example the 7th lord in the basic chart should be well placed in the navamsa not in enemy sign, debilated, etc.
there must be good relationship of lords 1/7 in the navamsa.
A navamsa chart is said to be read independently too, and one may have additional observations surprisingly correct on the ground.
Basic chart is the tree, navamsa is the fruit, manifested/unmanifested.
hope this helps with some basic idea of the navamsa relevance.
In south-india it is said no chart is read without the navamsa chart side by side, especially for marriage matching.
wishing well,
kshantaram