Most of those messages I've received (mostly early war period) don't even provide enough information to reliably intercept them. Often the speed or course or time is missing in the message.
The real renown is in the contact icons (single units mostly) that silently appear on the map, showing general course and general speed. Or the convoy reports that do come with a radio message identical to the message panel line.
The longitude and lattitude reports are only interesting if you have a map-fetish, ... like me.
120 km for every degree N, S, E or W of the equator/prime meridian.