A well trained and experienced astrologer employs a system that thoroughly examines the two horoscopes on three tiers:-
1. The general strength of each chart individually, with special attention paid to capacity for relationship and marriage.
2. A detailed examination of compatibility between the two charts based on all the planets, not just the Moon.
3. Calculations to determine the durability of the relationship. Many couples are attracted and seem compatible but later end up in divorce court, giving rise to the saying: Married in haste - lamented at leisure.
So be sure that the astrologer you are considering to do a compatibility reading is experienced in this area and that he uses a sophisticated technique such as outlined above.
Parents often consult astrologers to find out how they can best guide their beloved children. Astrology can point out what the compatibilities and incompatibilities are between parent and child.
Please treat these maps as indicative; The maps above will definitely get you close to your destination - but please don't hesitate asking around. After all, the best part of India is that everybody is always more than willing to help when giving out directions.