trouble adjusting PM900S motor

[viscom]

I live in Plantation florida zipcode 33324. I believe my latitude is 26.1N and longitude is 80.2W. Would my magnatic deviation be +5 and add this to (S) 180= 185. Would this calculation be my truesouth, and would my truesouth satellite be AMC 5 (79*w). Please check the calculation for me to see if Iam correct so I could do this the right way. I must admit that I began adjustment with 121*W without starting with the truesouth satellite to my longitude. I thought once I found signal for just one all the other satellites would fall in line when I select them, but Iam only able to pickup signal from just 121* satellite but not from the others. Please a respond by email would greatly be appreciated. Thank you!