ALTHOUGH still searching for their first win, Runcorn worked hard against former boss Alvin McDonald's Marine for a second successive UniBond League Premier Division home point.
The visitors have now drawn a blank twice in succession but remain unbeaten after starting with a couple of wins.
This derby was not short on effort but a little lacking in clear-cut chances as defences generally held sway.
Both sides did carry a first-half threat and before the game had settled Lee Parle - one of five former Linnets in the visiting ranks - curled a shot dangerously close.
Marine were troubled by the hard running of Tommy Taylor in attack.
Runcorn's best opportunity before the break came when Paul Scott miscued Adam Roscoe's right-wing cross into Taylor's path but the former Mariner in turn screwed his effort over the bar from the left of the six-yard box.
After half-time, Marine initially threatened to turn the screw with their main danger by now coming from the tricky wing play of Darren Brookfield.
As both sides toiled for a breakthrough, Andy Ralph twice held speculative shots from Scott. At the other end, a cross from Parle struck the bar with Mark Phillips making a crucial block to keep out the rebound from another ex-Linnet Carl Rendell.
RUNCORN: Holcroft, Phillips, Van Blerk, Potter, Robertson, McInerney, Whalley, Scott, Taylor, Roscoe (Hunter 67), Locke (Forster 74). Sub: Allen. MARINE: Ralph, Murphy, Hollis, Farley, Connolly, Brookfield, Moore (Ellison 83), Parle, Young, Rey (Rendell 74), Mullin. Sub: Black.