Back 'when it mattered', Maritime Mobile was identified as Region 1, 2, or 3. As in "K7IWH/R2".... when underway in the Pacific. I recall pulling into Kodiak once, while running phone patches, transitioning from 'Maritime Mobile Region Two", to "Mobile KL7", to "Portable KL7" when tied up.
It would be 'nice' if people operating in areas not reflected in their call, would sign 'Slant [X]', for CQ's or First Replies, to avoid swinging the Quad the wrong direction, but I've found very few OPs willing to do so. I was recently answered by a '2', swing the Quad East to Two -Land, and lost the guy for a while, as he was in San Diego.
ATTN: Wm F Hiller, N7DM
Please contact me ASAP. See my details at QRZ.com
Call me collect at 253-581-5823 or send me your phone number.
Very important. Please respond.
T J Lynn Jr Operator, K7IWH
USCGC NORTHWIND (WAGB 282) Memorial Radio Station (NRFJ)