Martin appeared in four games last season, starting one, and had four catches for 42 yards. With the addition of Percy Harvin and Chris Harper, Martin looked like a long shot to make Seattle's roster this season.
Nelson, who came into the league as an undrafted free agent in 2011 and has been on several teams' practice squads, snapped in six games last season for San Diego.
His signing, as well as that of LS Adam Steiner, who has since been released, is not a sign that the Seahawks are unhappy with current long snapper Clint Gresham, but rather that they likely want to avoid paying a long snapper $1.323 million, which is the value of the restricted free agent tender Gresham signed in the offseason. It would not be surprising to see the Seahawks and Gresham to agree to a multi-year deal worth less per season, especially if Nelson can do a good enough job in training camp to show he is a viable alternative if Gresham weren't willing to redo his deal.
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