Marinetraffic.com has receivers only. They will never come up as base stations.
Base stations you see are government, coast guard, harbour authorities etc.
To know if Marinetraffic.com works in your area you need to see vessels on it that are very close to you.
ProAIS2 will show you that you are transmitting, but to check how far you need another boat to check for you when they are moving away from you. The difficulty is the digital package should go further than voice, so you cant hear them tell you on VHF that they can no longer see you.