Jax is probably correct that it was little used around 1800.

I understand what did lunars in was the more affordable chronometer by about
the mid 19th century.

Even after
Bowditch was published in 1802 there were very few seamen who could handle
the
math.

I understand the math is tedious, more particularly so before machines made
multiplying and dividing easier (1890's, early 1900's).

Commercial radio stations came on the air in 1921 (IIRC) and were required to
give their call sign, frequency and city every ten minutes specificly to aid
ships at sea in navigation. This radio required lasted (I believe) into the
1980's by which time it was more than thoroughly obsolete.