Endeavour Morse as in the UK TV series. Googling Endeavour would have given you a first hit for the series.
So, Morse Code. Write out the list of dots and dashes, re-punctuate and you have two numbers for spot heights!
Here's the full encrypted list:
57 ...../--... encoded as .../././--/... SEEMS
64 -..../....- encoded as -../../..././- DISET
79 --.../----. encoded as --./././---/-. GEEON
54 ...../....- encoded as ..../../...- HIV
52 ...../..--- encoded as ../.../../--- ISIO
45 ....-/..... encoded as ./.../-/.../.. ESTSI
42 ....-/..--- encoded as ..../-./.-/-- HNAM
38 ...--/---.. encoded as .../---/--.. SOZ
43NNW ....-/...-- encoded as ./...-/./../-- EVIEM
48 ....-/---.. encoded as .../.-/-/--.. SATZ
25 ..---/..... encoded as ../---/..../. IOHE
48 ....-/---.. encoded as ..././-/-/-/-/./. SETTTTEE
(33) ...--/...-- encoded as ...-/-/...-/- VTVT
37 ...--/--... encoded as .../--/--./.. SMGI
54 ...../....- encoded as ...././.../.- HESA
36 ...--/-.... encoded as .../---/.../. SOSE
52 ...../..---- encoded as ./././././././--- EEEEEEEO
41 ....-/.---- encoded as ..././-/./--/-- SETEMM
34SSE ...--/....- encoded as ../.--/.../.- IWSA
49 ....-/----. encoded as ..../---/-/-/. HOTTE
47 ....-/--... encoded as ..../---/... HOS
SSW35 ...--/..... encoded as .../--/.../.. SMSI
33 ...--/...-- encoded as ...-/-./..-/- VNUT
45 ....-/..... encoded as ../../-..../. II6E
47 ....-/--... encoded as ../..---/... I2S
35 ...--/..... encoded as .../--.../..S7I
45 ....-/..... encoded as ../..-/../../. IUIIE
53 ...../...-- encoded as ..././....-/- SE4T
There was a 1 second shortcut bottom right of the route near GL19.