I agree CatFan, a thousandth of a minute gets you down into the 6-foot range which is a whole lot better than 100-foot range! Even better than that is using an all degree number. Not sure what his HDS8 is capable of but five decimal places in degrees will get you down into the 3-foot range. I guess to get better than that your system would have allow for six or more decimal places or switch to using the UTM system. When I help Customers convert their waypoints I always use the DD.ddddd system for its better accuracy. It takes a little math to get to the all decimal numbers but using an EXCEL spreadsheet helps when there is more than just a few to deal with.

Edit: Oops! Did not see your post crappiepappy. Guess you were posting while I was still typing. Decimal degrees is definitely the way to go if you want accurate waypoints!