Mr Chudley, whohas also drawn dinosaurs and cartoon characters in the same way, said the ideawas "very me".
He explained hehad run about 15 miles (24km) in total, but had the GPS tracking turned on tospell out the lettering over 5.7 miles (9km).
Mr Chudley toldhis girlfriend he was going out for a run before posting the map on Facebookand returning, with flowers and a ring, to hear her response.
He admittedposting it publically "could have been very embarrassing if she had saidno".
In the past he hasattempted a seahorse, dinosaur and Spongebob Squarepants but said Portsmouth's regularstreet layout made lettering more straightforward.