We use USGS 250k 100k or 7.5 Quads, whatever looks the best.?ÿ ?ÿ

@jflamm Sorry for some reason I was not receiving notifications for this post. Probably internal spam blocking. But to answer no, T Baker Smith

@holy-cow Sure! I'm a hydrographic surveyor out of South Louisiana. Enjoy the craft & learning from others.?ÿ