Baybum
The frequency that is listed for NRP Ocean City 156.1725 DPL432, it carries all land and marine traffic in the Ocean City Area, also monitor all Marine Channels as they converse back & fourth on those as well. All NRP frequencies carry land and marine traffic, as NRP officers are cross trained to do both. So any frequency in the database under DNR Police new will be what you need to listen to. All freqeuncies that use the same PL/DPL tone are regions that are set up and those frequencies carry simulcasted traffic. So NRP Hereford 155.370 DPL 631 carries the same traffic as NRP Hollofield 159.090 DPL 631.
Nathan