Last fall I bought a S H CP150.Finally today I got around to hooking it up.Problem,it won't find my position.Shows it is finding 3 sats.Is this o.k.? Other station(lowrance lcx15)locks on to 7 sats.Both antennas are in same spot so I know they are in the open enough.This unit has never been used before.Am I missing something in the initial startup?