Clammer...
feel your pain...
We were working (are working) at Chatham/Pleasant Bay.... trailered up our tin workboat 7 pr 8 times in the past year for a survey that takes ~2hrs and only at dead spring low...
1 of the times the old decrepid motor wouldnt start, missed our tide window... some repair work and it was ready
Another time we got it started after changing plugs (again) and almost missed our window, and only did half the survey cause I couldnt shut the boat off and work...
1 time it was so foggy we couldnt see the end of the ramp... went fishing off the beach instead and then

so not a wasted day
The last time we took that boat up there the entire coil on the head shattered... since its a 20yr 'rude we said f'it brought the boat back, got smart and found a local who lets us use his spiffy 13ft whaler with a 4stroke...
FINALLY we took the F'ing hint (we geologists are a stubborn lot....)