Mariner Girl Scouts
The first mention I found for sea-fairing scouting was in a 1925 Girl Scout Leader magazine, listing the trainings available over the summer at the National Training Schools for Girl Scouts. Two classes were offered at the school in Marion, MA: Sea Scout Experiment and Sea Scout Camp for Girl Scouts (over 16). It's from courses like these, as well as the natural interest in sailing for the "older girls" in Girl Scouting, that the Mariner program grew.
In 1932 newspaper articles were already telling tales
of Mariner Girl Scouts in many cities. It was described by
"national HQ" that... Mariner Scouting was a post-
graduate course of Girl Scouting. It opens a new field of
adventure with the romance and the background of the sea
to sustain the interest of the older girls.
Officially launched in 1934, it sprang forth as a program
whose time had come. The Girl Scout Spring 1935 catalog
Mariner uniform: middy style shirt, skirt, slacks, shorts
2 hat styles (Gob and Beret) & black Mariner tie
Unique membership pin
and 2 styles of Mariner flags
(one for the ship & one for parades)
The only image I have found of the Mariner swimsuit. Other GS catalogs note that it came with the Mariner patch, and the swimsuit was for Mariners ONLY
This catalog image above (used for years) shows one style of Mariner flag, while on another page in the same catalog is the flag shown below.
Early Mariner uniform (note all the buttons on the skirt). Shown with the Gob style hat. Missing the black Mariner tie.
1940 An early Mariner Girl Scout label
This posed shot of the new Mariner uniforms was done at the Boston Convention, where the Mariner Girl Scout program officially debut. This photo ran in every major newspaper.
Mariner Stationery, unknown year, may not be official
The smooth wheel design of the first Mariner pin lasted until supplies ran out, around 1946.
These Mariners went out on a 4-day sail, camping each night in a different area.
Midshipmite Pin added in 1955
These metal pins (shown above) are the most common. There are other variations known.
The "Gob" style of hat (or the Gilligan style if you're my age) was so popular they stopped selling the beret style.