Initial version

Makefile

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+gp102-poi: gp102-poi.c
+	gcc -W -Wall -o $@ $<

README

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+Based on Canmore G-Porter POI Reader by Archil Imnadze,
+https://github.com/aimnadze/canmore-gporter-poi-reader

gp102-poi.c

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+#include <errno.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <endian.h>
+
+struct poi_data {
+	uint8_t unknown1;	/* seems to be always 0x01 */
+	uint8_t icon;
+	uint8_t unknown2[10];	/* seems to be always 0x00 0x00 0x10 followed by zeros */
+	char name[10];
+	uint8_t unknown3[54];	/* seems to be always zeros; perhaps still (part of) the name? */
+	uint32_t lat;
+	uint32_t lon;
+	uint8_t unused[44];	/* 0xff */
+};
+
+static char icon_names[][11] = {
+	"star", "home", "checkpoint",
+	"car", "cafe", "train",
+	"gas", "office", "airport",
+};
+#define ICONS	(sizeof(icon_names) / sizeof(icon_names[0]))
+
+static void print_coord(double coord, int len, const char *mod)
+{
+	int deg = abs((int)coord);
+
+	printf("%c %0*d° %06.3f", mod[!!(coord < 0)], len, deg, (fabs(coord) - deg) * 60);
+}
+
+static int read_poi(const char *fname)
+{
+	FILE *f;
+	struct poi_data data;
+	uint8_t buf;
+	double lat, lon;
+
+	f = fopen(fname, "rb");
+	if (!f)
+		goto err;
+	if (fread(&data, sizeof(data), 1, f) < 1)
+		goto err;
+	if (fread(&buf, 1, 1, f)) {
+		fprintf(stderr, "Error: unexpected size of `%s'.\n", fname);
+		fclose(f);
+		return 1;
+	}
+	fclose(f);
+
+	if (data.icon >= ICONS) {
+		fprintf(stderr, "Error: %s: invalid file type.\n", fname);
+		return 1;
+	}
+	if (data.unknown1 != 0x01)
+		fprintf(stderr, "Warning: %s: invalid signature, continuing anyway.\n", fname);
+	lat = (double)(int32_t)le32toh(data.lat) / 100000;
+	lon = (double)(int32_t)le32toh(data.lon) / 100000;
+	printf("%s (%s) ", data.name, icon_names[data.icon]);
+	print_coord(lat, 2, "NS");
+	printf(" ");
+	print_coord(lon, 3, "EW");
+	printf("\n");
+
+	return 0;
+
+err:
+	fprintf(stderr, "Error reading from `%s': %s\n", fname, strerror(errno));
+	if (f)
+		fclose(f);
+	return 1;
+}
+
+int main(int argc, char **argv)
+{
+	int i, err = 0;
+
+	if (argc <= 1) {
+		printf("Usage: %s poi_file [poi_file...]\n", argv[0]);
+		return 1;
+	}
+
+	for (i = 1; i < argc; i++)
+		err |= read_poi(argv[i]);
+	return err;
+}