I am looking at genomic data (HG19). I have many SNPs, their chromosomes and positions.
I want to look at certain SNP (suppose its chromosome is 1 and position 77,226,919), and extract all SNPs in distance 1mb from that SNP.

Are the HG19 position in terms of base-pairs? Meaning that I need to take all SNPs in position $77,226,919 \pm100,000$? Or is it something else?